Move 2015 out of the way.

2025-12-25 12:50:32 +01:00 · 2016-12-01 11:25:19 +01:00
parent a75d14ec17
commit b37fd44fa7
50 changed files with 0 additions and 0 deletions
--- a/2015/README.md
+++ b/2015/README.md
@@ -0,0 +1,20 @@
+# Advent of Code solution repository
+
+In this repository are the programs used to solve the [Avent of
+Code](http://adventofcode.com) challenges. Each day has its very own folder
+containing a program and optionally an input file.
+
+I am using the Advent of Code to teach myself python. I personally notice an
+improvement over time, and thus over the programs I create. Some programs I
+have revisited for a more efficient implementation and gave them a small README
+detailing my algorithm.
+
+As a coding standard, I try to make code that can be run with:
+* Python 2.7
+* Python 3
+* Pypy
+
+Most of the code runs the fastest in Pypy, but there are exceptions.
+
+All this code is under MIT license. Use it for whatever you want, but please do
+credit me.
--- a/2015/day-01/input.txt
+++ b/2015/day-01/input.txt
--- a/2015/day-01/solution.py
+++ b/2015/day-01/solution.py
@@ -0,0 +1,18 @@
+from __future__ import print_function
+import fileinput
+
+floor = 0
+seenBasement = False
+
+for line in fileinput.input():
+    for idx, c in enumerate(line.strip()):
+        if c == '(':
+            floor += 1
+        else:
+            floor -= 1
+
+        if not seenBasement and floor == -1:
+            seenBasement = True
+            print("Basement reached at", idx + 1)
+
+print("Finally arrived at", floor)
--- a/2015/day-02/input.txt
+++ b/2015/day-02/input.txt
--- a/2015/day-02/solution.py
+++ b/2015/day-02/solution.py
@@ -0,0 +1,21 @@
+from __future__ import print_function
+import fileinput
+from operator import mul
+from functools import reduce
+import itertools
+
+totalArea = 0
+totalRibbon = 0
+for line in fileinput.input():
+    parts = [int(i) for i in line.split('x')]
+    parts.sort()
+
+    sides = [x * y for x, y in itertools.combinations(parts, 2)]
+    totalArea += 2 * sum(sides) + min(sides)
+
+    totalRibbon += 2 * (parts[0] + parts[1])
+    totalRibbon += reduce(mul, parts, 1)
+
+print(totalArea, "paper")
+print(totalRibbon, "ribbon")
+
--- a/2015/day-03/input.txt
+++ b/2015/day-03/input.txt
--- a/2015/day-03/solution.py
+++ b/2015/day-03/solution.py
@@ -0,0 +1,29 @@
+from __future__ import print_function
+import fileinput
+
+def move(pos, c):
+    if c == '<':
+        pos = (pos[0] + 1, pos[1])
+    elif c == '>':
+        pos = (pos[0] - 1, pos[1])
+    elif c == '^':
+        pos = (pos[0], pos[1] + 1)
+    elif c == 'v':
+        pos = (pos[0], pos[1] - 1)
+
+    return pos
+
+pos = (0, 0)
+pos2 = pos
+places = set([pos])
+
+for line in fileinput.input():
+    for idx,c in enumerate(line):
+        if idx % 2 == 0:
+            pos = move(pos, c)
+            places.add(pos)
+        else:
+            pos2 = move(pos2, c)
+            places.add(pos2)
+
+print("Houses:", len(places))
--- a/2015/day-04/input.txt
+++ b/2015/day-04/input.txt
@@ -0,0 +1 @@
+bgvyzdsv
--- a/2015/day-04/solution.py
+++ b/2015/day-04/solution.py
@@ -0,0 +1,32 @@
+from __future__ import print_function
+import sys
+from hashlib import md5
+import fileinput
+
+def ok(digest, zeroes):
+    for c in digest[0:zeroes]:
+        if c != "0":
+            return False
+
+    return True
+
+def solve(word, zeroes):
+    number = 0
+
+    while True:
+        digester = md5(word.encode("utf-8"))
+        digester.update(str(number).encode("utf-8"))
+
+        if ok(digester.hexdigest(), zeroes):
+            print(word, number)
+            break
+
+        number = number + 1
+
+    return number
+
+for line in fileinput.input():
+    word = line.strip()
+
+    solve(word, 5)
+    solve(word, 6)
--- a/2015/day-05/input.txt
+++ b/2015/day-05/input.txt
--- a/2015/day-05/solution.py
+++ b/2015/day-05/solution.py
@@ -0,0 +1,23 @@
+from __future__ import print_function
+import fileinput
+import re
+
+nice1 = 0
+nice2 = 0
+
+doubleletter = re.compile(r"(.)\1")
+vowels = re.compile(r"[aeiou]")
+forbidden = re.compile(r"ab|cd|pq|xy")
+
+inbetween = re.compile(r"(.).\1")
+twodouble = re.compile(r"(.)(.)(.*?)\1\2")
+
+for line in fileinput.input():
+    if len(vowels.findall(line)) >= 3 and doubleletter.search(line) and not forbidden.search(line):
+        nice1 += 1
+
+    if inbetween.search(line) and twodouble.search(line):
+        nice2 += 1
+
+print(nice1, "nice1 strings.")
+print(nice2, "nice2 strings.")
--- a/2015/day-06/README.md
+++ b/2015/day-06/README.md
@@ -0,0 +1,32 @@
+# Day 6 efficient solution
+
+For day 6, we have an array of lights (first booleans, then integers) on which
+we want to perform some tasks, and then know the end result. To do so, the
+easiest method is to simulate that process.
+
+All operations execute on a specific rectangle of lights. This means that we
+need to modify a potentially large number of lights at the same time. This is a
+rather costly operation.
+
+To get around this, we use run length encoding. Instead of storing a boolean
+for each light, we store, per column, a list of runs of lights that are in the
+same state. That way, the complexity of lights to flip is now proportional to
+the number of rows we need to flip.
+
+## Updating the runs
+
+When we need to update the runs for a given column, we iterate over all runs
+that are in that column. If a run is within the row range that we need to
+modify, we can set the state of the run to the proper value. You may need to
+split the run in several parts that are not all affected by the modification.
+
+As a second step, we try to combine adjacent runs that are in the same state.
+This reduces the cost of iterating over all of them significantly.
+
+## Performance analysis
+
+On my computer, the naive brute force implementation took about 5 seconds for
+both part 1 and part 2. When running the run length implementation on the first
+part, the algorithm is 20 times faster. However, on the second part, the
+algorithm is only slightly faster (3.5 seconds) because runs can have more
+values, and are thus not as easily combined.
--- a/2015/day-06/input.txt
+++ b/2015/day-06/input.txt
@@ -0,0 +1,300 @@
+turn off 660,55 through 986,197
+turn off 341,304 through 638,850
+turn off 199,133 through 461,193
+toggle 322,558 through 977,958
+toggle 537,781 through 687,941
+turn on 226,196 through 599,390
+turn on 240,129 through 703,297
+turn on 317,329 through 451,798
+turn on 957,736 through 977,890
+turn on 263,530 through 559,664
+turn on 158,270 through 243,802
+toggle 223,39 through 454,511
+toggle 544,218 through 979,872
+turn on 313,306 through 363,621
+toggle 173,401 through 496,407
+toggle 333,60 through 748,159
+turn off 87,577 through 484,608
+turn on 809,648 through 826,999
+toggle 352,432 through 628,550
+turn off 197,408 through 579,569
+turn off 1,629 through 802,633
+turn off 61,44 through 567,111
+toggle 880,25 through 903,973
+turn on 347,123 through 864,746
+toggle 728,877 through 996,975
+turn on 121,895 through 349,906
+turn on 888,547 through 931,628
+toggle 398,782 through 834,882
+turn on 966,850 through 989,953
+turn off 891,543 through 914,991
+toggle 908,77 through 916,117
+turn on 576,900 through 943,934
+turn off 580,170 through 963,206
+turn on 184,638 through 192,944
+toggle 940,147 through 978,730
+turn off 854,56 through 965,591
+toggle 717,172 through 947,995
+toggle 426,987 through 705,998
+turn on 987,157 through 992,278
+toggle 995,774 through 997,784
+turn off 796,96 through 845,182
+turn off 451,87 through 711,655
+turn off 380,93 through 968,676
+turn on 263,468 through 343,534
+turn on 917,936 through 928,959
+toggle 478,7 through 573,148
+turn off 428,339 through 603,624
+turn off 400,880 through 914,953
+toggle 679,428 through 752,779
+turn off 697,981 through 709,986
+toggle 482,566 through 505,725
+turn off 956,368 through 993,516
+toggle 735,823 through 783,883
+turn off 48,487 through 892,496
+turn off 116,680 through 564,819
+turn on 633,865 through 729,930
+turn off 314,618 through 571,922
+toggle 138,166 through 936,266
+turn on 444,732 through 664,960
+turn off 109,337 through 972,497
+turn off 51,432 through 77,996
+turn off 259,297 through 366,744
+toggle 801,130 through 917,544
+toggle 767,982 through 847,996
+turn on 216,507 through 863,885
+turn off 61,441 through 465,731
+turn on 849,970 through 944,987
+toggle 845,76 through 852,951
+toggle 732,615 through 851,936
+toggle 251,128 through 454,778
+turn on 324,429 through 352,539
+toggle 52,450 through 932,863
+turn off 449,379 through 789,490
+turn on 317,319 through 936,449
+toggle 887,670 through 957,838
+toggle 671,613 through 856,664
+turn off 186,648 through 985,991
+turn off 471,689 through 731,717
+toggle 91,331 through 750,758
+toggle 201,73 through 956,524
+toggle 82,614 through 520,686
+toggle 84,287 through 467,734
+turn off 132,367 through 208,838
+toggle 558,684 through 663,920
+turn on 237,952 through 265,997
+turn on 694,713 through 714,754
+turn on 632,523 through 862,827
+turn on 918,780 through 948,916
+turn on 349,586 through 663,976
+toggle 231,29 through 257,589
+toggle 886,428 through 902,993
+turn on 106,353 through 236,374
+turn on 734,577 through 759,684
+turn off 347,843 through 696,912
+turn on 286,699 through 964,883
+turn on 605,875 through 960,987
+turn off 328,286 through 869,461
+turn off 472,569 through 980,848
+toggle 673,573 through 702,884
+turn off 398,284 through 738,332
+turn on 158,50 through 284,411
+turn off 390,284 through 585,663
+turn on 156,579 through 646,581
+turn on 875,493 through 989,980
+toggle 486,391 through 924,539
+turn on 236,722 through 272,964
+toggle 228,282 through 470,581
+toggle 584,389 through 750,761
+turn off 899,516 through 900,925
+turn on 105,229 through 822,846
+turn off 253,77 through 371,877
+turn on 826,987 through 906,992
+turn off 13,152 through 615,931
+turn on 835,320 through 942,399
+turn on 463,504 through 536,720
+toggle 746,942 through 786,998
+turn off 867,333 through 965,403
+turn on 591,477 through 743,692
+turn off 403,437 through 508,908
+turn on 26,723 through 368,814
+turn on 409,485 through 799,809
+turn on 115,630 through 704,705
+turn off 228,183 through 317,220
+toggle 300,649 through 382,842
+turn off 495,365 through 745,562
+turn on 698,346 through 744,873
+turn on 822,932 through 951,934
+toggle 805,30 through 925,421
+toggle 441,152 through 653,274
+toggle 160,81 through 257,587
+turn off 350,781 through 532,917
+toggle 40,583 through 348,636
+turn on 280,306 through 483,395
+toggle 392,936 through 880,955
+toggle 496,591 through 851,934
+turn off 780,887 through 946,994
+turn off 205,735 through 281,863
+toggle 100,876 through 937,915
+turn on 392,393 through 702,878
+turn on 956,374 through 976,636
+toggle 478,262 through 894,775
+turn off 279,65 through 451,677
+turn on 397,541 through 809,847
+turn on 444,291 through 451,586
+toggle 721,408 through 861,598
+turn on 275,365 through 609,382
+turn on 736,24 through 839,72
+turn off 86,492 through 582,712
+turn on 676,676 through 709,703
+turn off 105,710 through 374,817
+toggle 328,748 through 845,757
+toggle 335,79 through 394,326
+toggle 193,157 through 633,885
+turn on 227,48 through 769,743
+toggle 148,333 through 614,568
+toggle 22,30 through 436,263
+toggle 547,447 through 688,969
+toggle 576,621 through 987,740
+turn on 711,334 through 799,515
+turn on 541,448 through 654,951
+toggle 792,199 through 798,990
+turn on 89,956 through 609,960
+toggle 724,433 through 929,630
+toggle 144,895 through 201,916
+toggle 226,730 through 632,871
+turn off 760,819 through 828,974
+toggle 887,180 through 940,310
+toggle 222,327 through 805,590
+turn off 630,824 through 885,963
+turn on 940,740 through 954,946
+turn on 193,373 through 779,515
+toggle 304,955 through 469,975
+turn off 405,480 through 546,960
+turn on 662,123 through 690,669
+turn off 615,238 through 750,714
+turn on 423,220 through 930,353
+turn on 329,769 through 358,970
+toggle 590,151 through 704,722
+turn off 884,539 through 894,671
+toggle 449,241 through 984,549
+toggle 449,260 through 496,464
+turn off 306,448 through 602,924
+turn on 286,805 through 555,901
+toggle 722,177 through 922,298
+toggle 491,554 through 723,753
+turn on 80,849 through 174,996
+turn off 296,561 through 530,856
+toggle 653,10 through 972,284
+toggle 529,236 through 672,614
+toggle 791,598 through 989,695
+turn on 19,45 through 575,757
+toggle 111,55 through 880,871
+turn off 197,897 through 943,982
+turn on 912,336 through 977,605
+toggle 101,221 through 537,450
+turn on 101,104 through 969,447
+toggle 71,527 through 587,717
+toggle 336,445 through 593,889
+toggle 214,179 through 575,699
+turn on 86,313 through 96,674
+toggle 566,427 through 906,888
+turn off 641,597 through 850,845
+turn on 606,524 through 883,704
+turn on 835,775 through 867,887
+toggle 547,301 through 897,515
+toggle 289,930 through 413,979
+turn on 361,122 through 457,226
+turn on 162,187 through 374,746
+turn on 348,461 through 454,675
+turn off 966,532 through 985,537
+turn on 172,354 through 630,606
+turn off 501,880 through 680,993
+turn off 8,70 through 566,592
+toggle 433,73 through 690,651
+toggle 840,798 through 902,971
+toggle 822,204 through 893,760
+turn off 453,496 through 649,795
+turn off 969,549 through 990,942
+turn off 789,28 through 930,267
+toggle 880,98 through 932,434
+toggle 568,674 through 669,753
+turn on 686,228 through 903,271
+turn on 263,995 through 478,999
+toggle 534,675 through 687,955
+turn off 342,434 through 592,986
+toggle 404,768 through 677,867
+toggle 126,723 through 978,987
+toggle 749,675 through 978,959
+turn off 445,330 through 446,885
+turn off 463,205 through 924,815
+turn off 417,430 through 915,472
+turn on 544,990 through 912,999
+turn off 201,255 through 834,789
+turn off 261,142 through 537,862
+turn off 562,934 through 832,984
+turn off 459,978 through 691,980
+turn off 73,911 through 971,972
+turn on 560,448 through 723,810
+turn on 204,630 through 217,854
+turn off 91,259 through 611,607
+turn on 877,32 through 978,815
+turn off 950,438 through 974,746
+toggle 426,30 through 609,917
+toggle 696,37 through 859,201
+toggle 242,417 through 682,572
+turn off 388,401 through 979,528
+turn off 79,345 through 848,685
+turn off 98,91 through 800,434
+toggle 650,700 through 972,843
+turn off 530,450 through 538,926
+turn on 428,559 through 962,909
+turn on 78,138 through 92,940
+toggle 194,117 through 867,157
+toggle 785,355 through 860,617
+turn off 379,441 through 935,708
+turn off 605,133 through 644,911
+toggle 10,963 through 484,975
+turn off 359,988 through 525,991
+turn off 509,138 through 787,411
+toggle 556,467 through 562,773
+turn on 119,486 through 246,900
+turn on 445,561 through 794,673
+turn off 598,681 through 978,921
+turn off 974,230 through 995,641
+turn off 760,75 through 800,275
+toggle 441,215 through 528,680
+turn off 701,636 through 928,877
+turn on 165,753 through 202,780
+toggle 501,412 through 998,516
+toggle 161,105 through 657,395
+turn on 113,340 through 472,972
+toggle 384,994 through 663,999
+turn on 969,994 through 983,997
+turn on 519,600 through 750,615
+turn off 363,899 through 948,935
+turn on 271,845 through 454,882
+turn off 376,528 through 779,640
+toggle 767,98 through 854,853
+toggle 107,322 through 378,688
+turn off 235,899 through 818,932
+turn on 445,611 through 532,705
+toggle 629,387 through 814,577
+toggle 112,414 through 387,421
+toggle 319,184 through 382,203
+turn on 627,796 through 973,940
+toggle 602,45 through 763,151
+turn off 441,375 through 974,545
+toggle 871,952 through 989,998
+turn on 717,272 through 850,817
+toggle 475,711 through 921,882
+toggle 66,191 through 757,481
+turn off 50,197 through 733,656
+toggle 83,575 through 915,728
+turn on 777,812 through 837,912
+turn on 20,984 through 571,994
+turn off 446,432 through 458,648
+turn on 715,871 through 722,890
+toggle 424,675 through 740,862
+toggle 580,592 through 671,900
+toggle 296,687 through 906,775
--- a/2015/day-06/solution.py
+++ b/2015/day-06/solution.py
@@ -0,0 +1,87 @@
+from __future__ import print_function
+import fileinput
+import re
+import sys
+
+def compact(lightList):
+    last = None
+    newList = []
+    for streak in sorted(lightList):
+        if last is not None:
+            if streak[2] == last[2]:
+                # Repeating state, merge
+                last = (last[0], streak[1], last[2])
+                continue
+            else:
+                newList.append(last)
+
+        last = streak
+
+    newList.append(last)
+
+    return newList
+
+def updateState(sliceList, yStart, yEnd, updateFnc):
+    newList = []
+    for start, end, state in sliceList:
+        if not start <= yStart  <= end and not yStart <= start <= yEnd:
+            # Block not in range, skip
+            newList.append((start, end, state))
+            continue
+
+        if start < yStart:
+            # Split the block at the start
+            newList.append((start, yStart - 1, state))
+            start = yStart
+
+        if end > yEnd:
+            # Split the block at the end
+            newList.append((yEnd + 1, end, state))
+            end = yEnd
+
+        newList.append((start, end, updateFnc(state)))
+
+    return compact(newList)
+
+def colsum(lightList):
+    return sum(int(state) * (stop - start + 1) for start, stop, state in lightList)
+
+def getPart1Update(command):
+    if "toggle" in command:
+        return lambda x: not x
+    elif "on" in command:
+        return lambda _: True
+    else:
+        return lambda _: False
+
+def getPart2Update(command):
+    if "toggle" in command:
+        return lambda x: x + 2
+    elif "on" in command:
+        return lambda x: x + 1
+    else:
+        return lambda x: max(0, x - 1)
+
+lights1 = []
+lights2 = []
+for x in range(1000):
+    lights1.append([(0, 999, False)])
+    lights2.append([(0, 999, 0)])
+
+for line in fileinput.input():
+    match = re.search(r"^(toggle|turn (on|off)) (\d+),(\d+) through (\d+),(\d+)$", line)
+
+    xStart = int(match.group(3))
+    yStart = int(match.group(4))
+
+    xEnd = int(match.group(5))
+    yEnd = int(match.group(6))
+
+    command = match.group(1)
+
+    for x in range(xStart, xEnd + 1):
+        lights1[x] = updateState(lights1[x], yStart, yEnd, getPart1Update(command))
+        lights2[x] = updateState(lights2[x], yStart, yEnd, getPart2Update(command))
+
+print("Lights on:", sum(colsum(x) for x in lights1))
+print("Lumen:", sum(colsum(x) for x in lights2))
--- a/2015/day-07/input.txt
+++ b/2015/day-07/input.txt
@@ -0,0 +1,339 @@
+NOT dq -> dr
+kg OR kf -> kh
+ep OR eo -> eq
+44430 -> b
+NOT gs -> gt
+dd OR do -> dp
+eg AND ei -> ej
+y AND ae -> ag
+jx AND jz -> ka
+lf RSHIFT 2 -> lg
+z AND aa -> ac
+dy AND ej -> el
+bj OR bi -> bk
+kk RSHIFT 3 -> km
+NOT cn -> co
+gn AND gp -> gq
+cq AND cs -> ct
+eo LSHIFT 15 -> es
+lg OR lm -> ln
+dy OR ej -> ek
+NOT di -> dj
+1 AND fi -> fj
+kf LSHIFT 15 -> kj
+NOT jy -> jz
+NOT ft -> fu
+fs AND fu -> fv
+NOT hr -> hs
+ck OR cl -> cm
+jp RSHIFT 5 -> js
+iv OR jb -> jc
+is OR it -> iu
+ld OR le -> lf
+NOT fc -> fd
+NOT dm -> dn
+bn OR by -> bz
+aj AND al -> am
+cd LSHIFT 15 -> ch
+jp AND ka -> kc
+ci OR ct -> cu
+gv AND gx -> gy
+de AND dk -> dm
+x RSHIFT 5 -> aa
+et RSHIFT 2 -> eu
+x RSHIFT 1 -> aq
+ia OR ig -> ih
+bk LSHIFT 1 -> ce
+y OR ae -> af
+NOT ca -> cb
+e AND f -> h
+ia AND ig -> ii
+ck AND cl -> cn
+NOT jh -> ji
+z OR aa -> ab
+1 AND en -> eo
+ib AND ic -> ie
+NOT eh -> ei
+iy AND ja -> jb
+NOT bb -> bc
+ha OR gz -> hb
+1 AND cx -> cy
+NOT ax -> ay
+ev OR ew -> ex
+bn RSHIFT 2 -> bo
+er OR es -> et
+eu OR fa -> fb
+jp OR ka -> kb
+ea AND eb -> ed
+k AND m -> n
+et RSHIFT 3 -> ev
+et RSHIFT 5 -> ew
+hz RSHIFT 1 -> is
+ki OR kj -> kk
+NOT h -> i
+lv LSHIFT 15 -> lz
+as RSHIFT 1 -> bl
+hu LSHIFT 15 -> hy
+iw AND ix -> iz
+lf RSHIFT 1 -> ly
+fp OR fv -> fw
+1 AND am -> an
+ap LSHIFT 1 -> bj
+u LSHIFT 1 -> ao
+b RSHIFT 5 -> f
+jq AND jw -> jy
+iu RSHIFT 3 -> iw
+ih AND ij -> ik
+NOT iz -> ja
+de OR dk -> dl
+iu OR jf -> jg
+as AND bd -> bf
+b RSHIFT 3 -> e
+jq OR jw -> jx
+iv AND jb -> jd
+cg OR ch -> ci
+iu AND jf -> jh
+lx -> a
+1 AND cc -> cd
+ly OR lz -> ma
+NOT el -> em
+1 AND bh -> bi
+fb AND fd -> fe
+lf OR lq -> lr
+bn RSHIFT 3 -> bp
+bn AND by -> ca
+af AND ah -> ai
+cf LSHIFT 1 -> cz
+dw OR dx -> dy
+gj AND gu -> gw
+jg AND ji -> jj
+jr OR js -> jt
+bl OR bm -> bn
+gj RSHIFT 2 -> gk
+cj OR cp -> cq
+gj OR gu -> gv
+b OR n -> o
+o AND q -> r
+bi LSHIFT 15 -> bm
+dy RSHIFT 1 -> er
+cu AND cw -> cx
+iw OR ix -> iy
+hc OR hd -> he
+0 -> c
+db OR dc -> dd
+kk RSHIFT 2 -> kl
+eq LSHIFT 1 -> fk
+dz OR ef -> eg
+NOT ed -> ee
+lw OR lv -> lx
+fw AND fy -> fz
+dz AND ef -> eh
+jp RSHIFT 3 -> jr
+lg AND lm -> lo
+ci RSHIFT 2 -> cj
+be AND bg -> bh
+lc LSHIFT 1 -> lw
+hm AND ho -> hp
+jr AND js -> ju
+1 AND io -> ip
+cm AND co -> cp
+ib OR ic -> id
+NOT bf -> bg
+fo RSHIFT 5 -> fr
+ip LSHIFT 15 -> it
+jt AND jv -> jw
+jc AND je -> jf
+du OR dt -> dv
+NOT fx -> fy
+aw AND ay -> az
+ge LSHIFT 15 -> gi
+NOT ak -> al
+fm OR fn -> fo
+ff AND fh -> fi
+ci RSHIFT 5 -> cl
+cz OR cy -> da
+NOT ey -> ez
+NOT ju -> jv
+NOT ls -> lt
+kk AND kv -> kx
+NOT ii -> ij
+kl AND kr -> kt
+jk LSHIFT 15 -> jo
+e OR f -> g
+NOT bs -> bt
+hi AND hk -> hl
+hz OR ik -> il
+ek AND em -> en
+ao OR an -> ap
+dv LSHIFT 1 -> ep
+an LSHIFT 15 -> ar
+fo RSHIFT 1 -> gh
+NOT im -> in
+kk RSHIFT 1 -> ld
+hw LSHIFT 1 -> iq
+ec AND ee -> ef
+hb LSHIFT 1 -> hv
+kb AND kd -> ke
+x AND ai -> ak
+dd AND do -> dq
+aq OR ar -> as
+iq OR ip -> ir
+dl AND dn -> do
+iu RSHIFT 5 -> ix
+as OR bd -> be
+NOT go -> gp
+fk OR fj -> fl
+jm LSHIFT 1 -> kg
+NOT cv -> cw
+dp AND dr -> ds
+dt LSHIFT 15 -> dx
+et RSHIFT 1 -> fm
+dy RSHIFT 3 -> ea
+fp AND fv -> fx
+NOT p -> q
+dd RSHIFT 2 -> de
+eu AND fa -> fc
+ba AND bc -> bd
+dh AND dj -> dk
+lr AND lt -> lu
+he RSHIFT 1 -> hx
+ex AND ez -> fa
+df OR dg -> dh
+fj LSHIFT 15 -> fn
+NOT kx -> ky
+gk OR gq -> gr
+dy RSHIFT 2 -> dz
+gh OR gi -> gj
+lj AND ll -> lm
+x OR ai -> aj
+bz AND cb -> cc
+1 AND lu -> lv
+as RSHIFT 3 -> au
+ce OR cd -> cf
+il AND in -> io
+dd RSHIFT 1 -> dw
+NOT lo -> lp
+c LSHIFT 1 -> t
+dd RSHIFT 3 -> df
+dd RSHIFT 5 -> dg
+lh AND li -> lk
+lf RSHIFT 5 -> li
+dy RSHIFT 5 -> eb
+NOT kt -> ku
+at OR az -> ba
+x RSHIFT 3 -> z
+NOT lk -> ll
+lb OR la -> lc
+1 AND r -> s
+lh OR li -> lj
+ln AND lp -> lq
+kk RSHIFT 5 -> kn
+ea OR eb -> ec
+ci AND ct -> cv
+b RSHIFT 2 -> d
+jp RSHIFT 1 -> ki
+NOT cr -> cs
+NOT jd -> je
+jp RSHIFT 2 -> jq
+jn OR jo -> jp
+lf RSHIFT 3 -> lh
+1 AND ds -> dt
+lf AND lq -> ls
+la LSHIFT 15 -> le
+NOT fg -> fh
+at AND az -> bb
+au AND av -> ax
+kw AND ky -> kz
+v OR w -> x
+kk OR kv -> kw
+ks AND ku -> kv
+kh LSHIFT 1 -> lb
+1 AND kz -> la
+NOT kc -> kd
+x RSHIFT 2 -> y
+et OR fe -> ff
+et AND fe -> fg
+NOT ac -> ad
+jl OR jk -> jm
+1 AND jj -> jk
+bn RSHIFT 1 -> cg
+NOT kp -> kq
+ci RSHIFT 3 -> ck
+ev AND ew -> ey
+1 AND ke -> kf
+cj AND cp -> cr
+ir LSHIFT 1 -> jl
+NOT gw -> gx
+as RSHIFT 2 -> at
+iu RSHIFT 1 -> jn
+cy LSHIFT 15 -> dc
+hg OR hh -> hi
+ci RSHIFT 1 -> db
+au OR av -> aw
+km AND kn -> kp
+gj RSHIFT 1 -> hc
+iu RSHIFT 2 -> iv
+ab AND ad -> ae
+da LSHIFT 1 -> du
+NOT bw -> bx
+km OR kn -> ko
+ko AND kq -> kr
+bv AND bx -> by
+kl OR kr -> ks
+1 AND ht -> hu
+df AND dg -> di
+NOT ag -> ah
+d OR j -> k
+d AND j -> l
+b AND n -> p
+gf OR ge -> gg
+gg LSHIFT 1 -> ha
+bn RSHIFT 5 -> bq
+bo OR bu -> bv
+1 AND gy -> gz
+s LSHIFT 15 -> w
+NOT ie -> if
+as RSHIFT 5 -> av
+bo AND bu -> bw
+hz AND ik -> im
+bp AND bq -> bs
+b RSHIFT 1 -> v
+NOT l -> m
+bp OR bq -> br
+g AND i -> j
+br AND bt -> bu
+t OR s -> u
+hz RSHIFT 5 -> ic
+gk AND gq -> gs
+fl LSHIFT 1 -> gf
+he RSHIFT 3 -> hg
+gz LSHIFT 15 -> hd
+hf OR hl -> hm
+1 AND gd -> ge
+fo OR fz -> ga
+id AND if -> ig
+fo AND fz -> gb
+gr AND gt -> gu
+he OR hp -> hq
+fq AND fr -> ft
+ga AND gc -> gd
+fo RSHIFT 2 -> fp
+gl OR gm -> gn
+hg AND hh -> hj
+NOT hn -> ho
+gl AND gm -> go
+he RSHIFT 5 -> hh
+NOT gb -> gc
+hq AND hs -> ht
+hz RSHIFT 3 -> ib
+hz RSHIFT 2 -> ia
+fq OR fr -> fs
+hx OR hy -> hz
+he AND hp -> hr
+gj RSHIFT 5 -> gm
+hf AND hl -> hn
+hv OR hu -> hw
+NOT hj -> hk
+gj RSHIFT 3 -> gl
+fo RSHIFT 3 -> fq
+he RSHIFT 2 -> hf
--- a/2015/day-07/solution.py
+++ b/2015/day-07/solution.py
@@ -0,0 +1,66 @@
+from __future__ import print_function
+import fileinput
+import re
+import sys
+
+recipe = {}
+values = {}
+
+def findValue(node):
+    match = re.search(r"\d+", node)
+    if match:
+        return int(match.group(0))
+
+    if node in values:
+        return values[node]
+
+    if node not in recipe:
+        sys.exit("Node without recipe '" + node + "'")
+
+    valueA = None
+    valueB = None
+    if recipe[node][0]:
+        valueA = findValue(recipe[node][0].strip())
+    if recipe[node][2]:
+        valueB = findValue(recipe[node][2])
+
+    action = recipe[node][1]
+    value = None
+    if action == "RSHIFT":
+        value = valueA >> valueB
+    elif action == "LSHIFT":
+        value = (valueA << valueB) & 0xffff
+    elif action == "NOT":
+        value = (~valueB) & 0xffff
+    elif action == "IS":
+        value = valueA & 0xffff
+    elif action == "AND":
+        value = valueA & valueB
+    elif action == "OR":
+        value = valueA | valueB
+    else:
+        sys.exit("Unsupported command " + action)
+
+    values[node] = value
+    return value
+
+opPattern = re.compile(r"(\w+ )?(RSHIFT|LSHIFT|NOT|AND|OR) (\w+) -> (\w+)")
+valuePattern = re.compile(r"(\w+) -> (\w+)")
+
+for line in fileinput.input():
+    match = valuePattern.match(line)
+    if match:
+        recipe[match.group(2)] = (match.group(1), "IS", "")
+    else:
+        match = opPattern.match(line)
+        if match.group(4) in recipe:
+            sys.exit("Node with multiple recipes")
+
+        recipe[match.group(4)] = (match.group(1), match.group(2), match.group(3))
+
+a = findValue("a")
+
+print("Initial a is ", a)
+values = {}
+values["b"] = a
+print("Secondary a is", findValue("a"))
--- a/2015/day-08/input.txt
+++ b/2015/day-08/input.txt
@@ -0,0 +1,300 @@
+"qxfcsmh"
+"ffsfyxbyuhqkpwatkjgudo"
+"byc\x9dyxuafof\\\xa6uf\\axfozomj\\olh\x6a"
+"jtqvz"
+"uzezxa\"jgbmojtwyfbfguz"
+"vqsremfk\x8fxiknektafj"
+"wzntebpxnnt\"vqndz\"i\x47vvjqo\""
+"higvez\"k\"riewqk"
+"dlkrbhbrlfrp\\damiauyucwhty"
+"d\""
+"qlz"
+"ku"
+"yy\"\"uoao\"uripabop"
+"saduyrntuswlnlkuppdro\\sicxosted"
+"tj"
+"zzphopswlwdhebwkxeurvizdv"
+"xfoheirjoakrpofles\"nfu"
+"q\xb7oh\"p\xce\"n"
+"qeendp\"ercwgywdjeylxcv"
+"dcmem"
+"\"i\x13r\"l"
+"ikso\xdcbvqnbrjduh\"uqudzki\xderwk"
+"wfdsn"
+"pwynglklryhtsqbno"
+"hcoj\x63iccz\"v\"ttr"
+"zf\x23\\hlj\\kkce\\d\\asy\"yyfestwcdxyfj"
+"xs"
+"m\"tvltapxdvtrxiy"
+"bmud"
+"k\"a"
+"b\"oas"
+"\"yexnjjupoqsxyqnquy\"uzfdvetqrc"
+"vdw\xe3olxfgujaj"
+"qomcxdnd\"\\cfoe\""
+"fpul"
+"m\"avamefphkpv"
+"vvdnb\\x\\uhnxfw\"dpubfkxfmeuhnxisd"
+"hey\\"
+"ldaeigghlfey"
+"eure\"hoy\xa5iezjp\\tm"
+"yygb\"twbj\\r\"\x10gmxuhmp\""
+"weirebp\x39mqonbtmfmd"
+"ltuz\\hs\"e"
+"ysvmpc"
+"g\x8amjtt\"megl\"omsaihifwa"
+"yimmm"
+"iiyqfalh"
+"cwknlaaf"
+"q\x37feg\xc6s\"xx"
+"uayrgeurgyp\\oi"
+"xhug\"pt\"axugllbdiggzhvy"
+"kdaarqmsjfx\xc3d"
+"\"vkwla"
+"d\""
+"tmroz\"bvfinxoe\\mum\"wmm"
+"\"n\"bbswxne\\p\\yr\"qhwpdd"
+"skzlkietklkqovjhvj\xfe"
+"pbg\\pab\"bubqaf\"obzcwxwywbs\\dhtq"
+"xxjidvqh\"lx\\wu\"ij"
+"daef\x5fe\x5b\\kbeeb\x13qnydtboof"
+"ogvazaqy\"j\x73"
+"y"
+"n\"tibetedldy\\gsamm\"nwu"
+"wldkvgdtqulwkad"
+"dpmxnj"
+"twybw\"cdvf\"mjdajurokbce"
+"ru\"\\lasij\"i"
+"roc\\vra\\lhrm"
+"pbkt\x60booz\"fjlkc"
+"j\x4dytvjwrzt"
+"\\uiwjkniumxcs"
+"cbhm\"nexccior\"v\"j\"nazxilmfp\x47"
+"qdxngevzrlgoq"
+"\"lrzxftytpobsdfyrtdqpjbpuwmm\x9e"
+"mdag\x0asnck\xc2ggj\"slb\"fjy"
+"wyqkhjuazdtcgkcxvjkpnjdae"
+"aixfk\xc0iom\x21vueob"
+"dkiiakyjpkffqlluhaetires"
+"ysspv\"lysgkvnmwbbsy"
+"gy\"ryexcjjxdm\"xswssgtr"
+"s"
+"ddxv"
+"qwt\"\x27puilb\"pslmbrsxhrz"
+"qdg\xc9e\\qwtknlvkol\x54oqvmchn\\"
+"lvo"
+"b"
+"fk\"aa\"\"yenwch\\\\on"
+"srig\x63hpwaavs\\\x80qzk\"xa\"\xe6u\\wr"
+"yxjxuj\"ghyhhxfj\"\xa6qvatre"
+"yoktqxjxkzrklkoeroil"
+"\"jfmik\""
+"smgseztzdwldikbqrh\""
+"jftahgctf\"hoqy"
+"tcnhicr\"znpgckt\"ble"
+"vqktnkodh\"lo\"a\\bkmdjqqnsqr"
+"ztnirfzqq"
+"s"
+"xx"
+"iqj\"y\\hqgzflwrdsusasekyrxbp\\ad"
+"\\xzjhlaiynkioz\"\"bxepzimvgwt"
+"s\x36rbw"
+"mniieztwrisvdx"
+"atyfxioy\x2b\\"
+"irde\x85\x5cvbah\\jekw\"ia"
+"bdmftlhkwrprmpat\"prfaocvp"
+"w\\k"
+"umbpausy"
+"zfauhpsangy"
+"p\"zqyw"
+"wtztypyqvnnxzvlvipnq\"zu"
+"deicgwq\\oqvajpbov\\or\"kgplwu"
+"mbzlfgpi\\\\zqcidjpzqdzxityxa"
+"lfkxvhma"
+"\xf2yduqzqr\"\\fak\"p\"n"
+"mpajacfuxotonpadvng"
+"anb\\telzvcdu\\a\xf2flfq"
+"lrs\"ebethwpmuuc\"\x86ygr"
+"qmvdbhtumzc\"ci"
+"meet"
+"yopg\x0fdxdq\"h\\ugsu\xffmolxjv"
+"uhy"
+"fzgidrtzycsireghazscvmwcfmw\\t"
+"cqohkhpgvpru"
+"bihyigtnvmevx\"xx"
+"xz"
+"zofomwotzuxsjk\"q\"mc\"js\"dnmalhxd"
+"\\ktnddux\\fqvt\"ibnjntjcbn"
+"ia"
+"htjadnefwetyp\xd5kbrwfycbyy"
+"\"\\hkuxqddnao"
+"meqqsz\x83luecpgaem"
+"cvks\x87frvxo\"svqivqsdpgwhukmju"
+"sgmxiai\\o\"riufxwjfigr\xdf"
+"fgywdfecqufccpcdn"
+"faghjoq\x28abxnpxj"
+"zuppgzcfb\"dctvp\"elup\"zxkopx"
+"xqs\x45xxdqcihbwghmzoa"
+"anbnlp\\cgcvm\"hc"
+"xf\"fgrngwzys"
+"nrxsjduedcy\x24"
+"\x71sxl\"gj\"sds\"ulcruguz\\t\\ssvjcwhi"
+"jhj\"msch"
+"qpovolktfwyiuyicbfeeju\x01"
+"nkyxmb\"qyqultgt\"nmvzvvnxnb"
+"ycsrkbstgzqb\"uv\\cisn"
+"s"
+"ueptjnn\"\"sh"
+"lp\"z\"d\"mxtxiy"
+"yzjtvockdnvbubqabjourf\"k\"uoxwle"
+"\x82\"wqm\""
+"\xb5cwtuks\x5fpgh"
+"wd"
+"tbvf"
+"ttbmzdgn"
+"vfpiyfdejyrlbgcdtwzbnm"
+"uc"
+"otdcmhpjagqix"
+"\\\xb1qso\"s"
+"scowax"
+"behpstjdh\xccqlgnqjyz\"eesn"
+"r\xe1cbnjwzveoomkzlo\\kxlfouhm"
+"jgrl"
+"kzqs\\r"
+"ctscb\x7fthwkdyko\"\x62pkf\"d\xe6knmhurg"
+"tc\"kw\x3ftt"
+"bxb\x5ccl"
+"jyrmfbphsldwpq"
+"jylpvysl\"\"juducjg"
+"en\\m\"kxpq\"wpb\\\""
+"madouht\"bmdwvnyqvpnawiphgac\""
+"vuxpk\"ltucrw"
+"aae\x60arr"
+"ttitnne\"kilkrgssnr\xfdurzh"
+"oalw"
+"pc\"\"gktkdykzbdpkwigucqni\"nxiqx"
+"dbrsaj"
+"bgzsowyxcbrvhtvekhsh\"qgd"
+"kudfemvk\"\"\"hkbrbil\"chkqoa"
+"zjzgj\\ekbhyfzufy"
+"\\acos\"fqekuxqzxbmkbnn\x1ejzwrm"
+"elxahvudn\"txtmomotgw"
+"\x2eoxmwdhelpr\"cgi\xf7pzvb"
+"eapheklx"
+"hfvma\"mietvc\"tszbbm\"czex"
+"h\"iiockj\\\xc1et"
+"d\"rmjjftm"
+"qlvhdcbqtyrhlc\\"
+"yy\"rsucjtulm\"coryri\"eqjlbmk"
+"tv"
+"r\"bfuht\\jjgujp\""
+"kukxvuauamtdosngdjlkauylttaokaj"
+"srgost\"\"rbkcqtlccu\x65ohjptstrjkzy"
+"yxwxl\\yjilwwxffrjjuazmzjs"
+"dxlw\\fkstu\"hjrtiafhyuoh\"sewabne"
+"\x88sj\"v"
+"rfzprz\xec\"oxqclu\"krzefp\\q"
+"cfmhdbjuhrcymgxpylllyvpni"
+"ucrmjvmimmcq\x88\xd9\"lz"
+"lujtt\""
+"gvbqoixn\"pmledpjmo\"flydnwkfxllf"
+"dvxqlbshhmelsk\x8big\"l"
+"mx\x54lma\x8bbguxejg"
+"\x66jdati\xeceieo"
+"\"iyyupixei\x54ff"
+"xohzf\"rbxsoksxamiu"
+"vlhthspeshzbppa\x4drhqnohjop\"\"mfjd"
+"f\"tvxxla\"vurian\"\"idjq\x3aptm\xc3olep"
+"gzqz"
+"kbq\\wogye\\altvi\\hbvmodny"
+"j\xd8"
+"ofjozdhkblvndl"
+"hbitoupimbawimxlxqze"
+"ypeleimnme"
+"xfwdrzsc\\oxqamawyizvi\\y"
+"enoikppx\xa1ixe\"yo\"gumye"
+"fb"
+"vzf"
+"zxidr"
+"cu\x31beirsywtskq"
+"lxpjbvqzztafwezd"
+"\\jyxeuo\x18bv"
+"b\"vawc\"p\\\\giern\"b"
+"odizunx\"\"t\\yicdn\"x\"sdiz"
+"\"\"tebrtsi"
+"ctyzsxv\xa6pegfkwsi\"tgyltaakytccb"
+"htxwbofchvmzbppycccliyik\xe5a"
+"ggsslefamsklezqkrd"
+"rcep\"fnimwvvdx\"l"
+"zyrzlqmd\x12egvqs\\llqyie"
+"\x07gsqyrr\\rcyhyspsvn"
+"butg\""
+"gb"
+"gywkoxf\"jsg\\wtopxvumirqxlwz"
+"rj\"ir\"wldwveair\x2es\"dhjrdehbqnzl"
+"ru\"elktnsbxufk\\ejufjfjlevt\\lrzd"
+"\"widsvok"
+"oy\"\x81nuesvw"
+"ay"
+"syticfac\x1cfjsivwlmy\"pumsqlqqzx"
+"m"
+"rjjkfh\x78cf\x2brgceg\"jmdyas\"\\xlv\xb6p"
+"tmuvo\"\x3ffdqdovjmdmkgpstotojkv\"as"
+"jd\\ojvynhxllfzzxvbn\"wrpphcvx"
+"pz"
+"\"twr"
+"n\\hdzmxe\"mzjjeadlz"
+"fb\"rprxuagvahjnri"
+"rfmexmjjgh\\xrnmyvnatrvfruflaqjnd"
+"obbbde\"co\"qr\"qpiwjgqahqm\\jjp\""
+"vpbq\"\"y\"czk\\b\x52ed\"lnzepobp"
+"syzeajzfarplydipny\"y\"\xe8ad"
+"mpyodwb"
+"\x47rakphlqqptd"
+"wa\"oj\"aiy"
+"a"
+"ropozx"
+"q\x51nbtlwa"
+"etukvgx\\jqxlkq"
+"\"tp\"rah\"pg\"s\"bpdtes\\tkasdhqd"
+"dn\"qqpkikadowssb\xcah\"dzpsf\\ect\"jdh"
+"pxunovbbrrn\\vullyn\"bno\"\"\"myfxlp\""
+"qaixyazuryvkmoulhcqaotegfj\\mpzm"
+"bvfrbicutzbjwn\\oml\"cf\"d\"ezcpv\"j"
+"rmbrdtneudemigdhelmb"
+"aq\\aurmbhy"
+"wujqvzw"
+"gf\"tssmvm\"gm\"hu\x9a\xb7yjawsa"
+"hrhqqxow\xe2gsydtdspcfqy\"zw\\ou"
+"ianwwf\\yko\\tdujhhqdi"
+"xylz\"zpvpab"
+"lwuopbeeegp"
+"aoop\x49jhhcexdmdtun"
+"\\\\mouqqcsgmz"
+"tltuvwhveau\x43b\"ymxjlcgiymcynwt"
+"gsugerumpyuhtjljbhrdyoj"
+"lnjm\xb8wg\"ajh"
+"zmspue\"nfttdon\\b\"eww"
+"\"w\x67jwaq\x7ernmyvs\\rmdsuwydsd\"th"
+"ogtgvtlmcvgllyv"
+"z\"fqi\"rvddoehrciyl"
+"yustxxtot\"muec\"xvfdbzunzvveq"
+"mqslw"
+"txqnyvzmibqgjs\xb6xy\x86nfalfyx"
+"kzhehlmkholov"
+"plpmywcnirrjutjguosh\\"
+"pydbnqofv\"dn\\m"
+"aegqof"
+"eambmxt\\dxagoogl\\zapfwwlmk"
+"afbmqitxxqhddlozuxcpjxgh"
+"vgts"
+"bfdpqtoxzzhmzcilehnflna"
+"s\"idpz"
+"\xcfhgly\"nlmztwybx\"ecezmsxaqw"
+"aackfgndqcqiy"
+"\x22unqdlsrvgzfaohoffgxzfpir\"s"
+"abh\"ydv\"kbpdhrerl"
+"bdzpg"
+"ekwgkywtmzp"
+"wtoodejqmrrgslhvnk\"pi\"ldnogpth"
+"njro\x68qgbx\xe4af\"\\suan"
--- a/2015/day-08/solution.py
+++ b/2015/day-08/solution.py
@@ -0,0 +1,31 @@
+from __future__ import print_function
+import fileinput
+import re
+
+totalLess = 0
+totalMore = 0
+
+for line in fileinput.input():
+    original = len(line)
+    diff = 2
+    plus = 2
+    escaped = False
+    for c in line:
+        if c == "\\" or c == "\"":
+            plus += 1
+
+        if c == "\\" and not escaped:
+            escaped = True
+            diff += 1
+            continue
+
+        if escaped and c == "x":
+            diff += 2
+
+        escaped = False
+
+    totalLess += diff
+    totalMore += plus
+
+print(totalLess, "less")
+print(totalMore, "more")
--- a/2015/day-09/input.txt
+++ b/2015/day-09/input.txt
@@ -0,0 +1,28 @@
+Tristram to AlphaCentauri = 34
+Tristram to Snowdin = 100
+Tristram to Tambi = 63
+Tristram to Faerun = 108
+Tristram to Norrath = 111
+Tristram to Straylight = 89
+Tristram to Arbre = 132
+AlphaCentauri to Snowdin = 4
+AlphaCentauri to Tambi = 79
+AlphaCentauri to Faerun = 44
+AlphaCentauri to Norrath = 147
+AlphaCentauri to Straylight = 133
+AlphaCentauri to Arbre = 74
+Snowdin to Tambi = 105
+Snowdin to Faerun = 95
+Snowdin to Norrath = 48
+Snowdin to Straylight = 88
+Snowdin to Arbre = 7
+Tambi to Faerun = 68
+Tambi to Norrath = 134
+Tambi to Straylight = 107
+Tambi to Arbre = 40
+Faerun to Norrath = 11
+Faerun to Straylight = 66
+Faerun to Arbre = 144
+Norrath to Straylight = 115
+Norrath to Arbre = 135
+Straylight to Arbre = 127
--- a/2015/day-09/solution.py
+++ b/2015/day-09/solution.py
@@ -0,0 +1,64 @@
+from __future__ import print_function
+import re
+import fileinput
+
+dist = {}
+visited = set()
+
+def computeMinDistance(startPoint):
+    visited.add(startPoint)
+
+    if len(dist) == len(visited):
+        maximum = 0
+        minimum = 0
+    else:
+        minimum = None
+        maximum = 0
+
+    for i in dist[startPoint]:
+        if i in visited:
+            continue
+
+        shortest, longest = computeMinDistance(i)
+
+        if shortest is not None:
+            shortest += dist[startPoint][i]
+            longest += dist[startPoint][i]
+
+            if minimum is None:
+                minimum = shortest
+                maximum = longest
+            else:
+                minimum = min(minimum, shortest)
+                maximum = max(maximum, longest)
+
+    visited.remove(startPoint)
+
+    return minimum, maximum
+
+
+
+linePattern = re.compile(r"(\w+) to (\w+) = (\d+)")
+
+for line in fileinput.input():
+    match = linePattern.match(line)
+    if match.group(1) not in dist:
+        dist[match.group(1)] = {}
+
+    if match.group(2) not in dist:
+        dist[match.group(2)] = {}
+
+    dist[match.group(1)][match.group(2)] = int(match.group(3))
+    dist[match.group(2)][match.group(1)] = int(match.group(3))
+
+minimum = None
+possible = []
+for i in dist:
+    shortest, longest = computeMinDistance(i)
+
+    if shortest is not None:
+        possible.append(shortest)
+        possible.append(longest)
+
+print("Shortest path is", min(possible))
+print("Longest path is", max(possible))
--- a/2015/day-10/solution.py
+++ b/2015/day-10/solution.py
@@ -0,0 +1,17 @@
+from __future__ import print_function
+import itertools
+
+def lookandsay(line):
+    return ''.join([str(len(list(it))) + c for c, it in itertools.groupby(line)])
+
+
+line = "1321131112"
+for x in range(40):
+    line = lookandsay(line)
+
+print("40:", len(line))
+
+for x in range(10):
+    line = lookandsay(line)
+
+print("50:", len(line))
--- a/2015/day-11/input.txt
+++ b/2015/day-11/input.txt
@@ -0,0 +1 @@
+hxbxwxba
--- a/2015/day-11/solution.py
+++ b/2015/day-11/solution.py
@@ -0,0 +1,63 @@
+from __future__ import print_function
+import string
+
+letters = [c for c in string.ascii_lowercase]
+
+password = "hxbxwxba"
+
+forbidden = set([letters.index(c) for c in "iol"])
+passwordCode = [letters.index(c) for c in password]
+
+def convert(password):
+    return [letters.index(c) for c in password]
+
+def isOk(password):
+    hasStreak = False
+    prev = -2
+    streak = 1
+    same = 0
+    sameChar = None
+    for x in password:
+        if x in forbidden:
+            return False
+
+        if x == prev + 1:
+            streak += 1
+            if streak >= 3:
+                hasStreak = True
+        else:
+            streak = 1
+
+        if x == prev and x is not sameChar:
+            same += 1
+            sameChar = x
+
+        prev = x
+
+    return hasStreak and same >= 2
+
+def incrementForbidden(password):
+    for idx, x in enumerate(password):
+        if x in forbidden:
+            password[idx] = (x + 1) % len(letters)
+            for i in range(idx + 1, len(password)):
+                password[i] = 0
+
+            return
+
+def increment(password):
+    carry = True
+    i = len(password)
+    while carry and i > 0:
+        i -= 1
+        password[i] = (password[i] + 1) % len(letters)
+        carry = password[i] == 0
+
+    incrementForbidden(password)
+
+for x in range(2):
+    increment(passwordCode)
+    while not isOk(passwordCode):
+        increment(passwordCode)
+
+    print("Next password is", ''.join([letters[c] for c in passwordCode]))
--- a/2015/day-12/input.txt
+++ b/2015/day-12/input.txt
--- a/2015/day-12/solution.py
+++ b/2015/day-12/solution.py
@@ -0,0 +1,24 @@
+from __future__ import print_function
+import fileinput
+import re
+import json
+
+def totals(obj):
+    if isinstance(obj, int):
+        return obj
+    if isinstance(obj, list):
+        return sum(totals(i) for i in obj)
+    if not isinstance(obj, dict) or "red" in list(obj.values()):
+        return 0
+
+    return sum(totals(i) for i in list(obj.values()))
+
+fileData = ''.join(line for line in fileinput.input())
+
+# Solve the first part by regex, no parsing needed.
+pattern = re.compile(r"-?\d+")
+total = sum(int(match) for match in pattern.findall(fileData))
+
+data = json.loads(fileData)
+
+print(total, totals(data))
--- a/2015/day-13/input.txt
+++ b/2015/day-13/input.txt
@@ -0,0 +1,56 @@
+Alice would lose 2 happiness units by sitting next to Bob.
+Alice would lose 62 happiness units by sitting next to Carol.
+Alice would gain 65 happiness units by sitting next to David.
+Alice would gain 21 happiness units by sitting next to Eric.
+Alice would lose 81 happiness units by sitting next to Frank.
+Alice would lose 4 happiness units by sitting next to George.
+Alice would lose 80 happiness units by sitting next to Mallory.
+Bob would gain 93 happiness units by sitting next to Alice.
+Bob would gain 19 happiness units by sitting next to Carol.
+Bob would gain 5 happiness units by sitting next to David.
+Bob would gain 49 happiness units by sitting next to Eric.
+Bob would gain 68 happiness units by sitting next to Frank.
+Bob would gain 23 happiness units by sitting next to George.
+Bob would gain 29 happiness units by sitting next to Mallory.
+Carol would lose 54 happiness units by sitting next to Alice.
+Carol would lose 70 happiness units by sitting next to Bob.
+Carol would lose 37 happiness units by sitting next to David.
+Carol would lose 46 happiness units by sitting next to Eric.
+Carol would gain 33 happiness units by sitting next to Frank.
+Carol would lose 35 happiness units by sitting next to George.
+Carol would gain 10 happiness units by sitting next to Mallory.
+David would gain 43 happiness units by sitting next to Alice.
+David would lose 96 happiness units by sitting next to Bob.
+David would lose 53 happiness units by sitting next to Carol.
+David would lose 30 happiness units by sitting next to Eric.
+David would lose 12 happiness units by sitting next to Frank.
+David would gain 75 happiness units by sitting next to George.
+David would lose 20 happiness units by sitting next to Mallory.
+Eric would gain 8 happiness units by sitting next to Alice.
+Eric would lose 89 happiness units by sitting next to Bob.
+Eric would lose 69 happiness units by sitting next to Carol.
+Eric would lose 34 happiness units by sitting next to David.
+Eric would gain 95 happiness units by sitting next to Frank.
+Eric would gain 34 happiness units by sitting next to George.
+Eric would lose 99 happiness units by sitting next to Mallory.
+Frank would lose 97 happiness units by sitting next to Alice.
+Frank would gain 6 happiness units by sitting next to Bob.
+Frank would lose 9 happiness units by sitting next to Carol.
+Frank would gain 56 happiness units by sitting next to David.
+Frank would lose 17 happiness units by sitting next to Eric.
+Frank would gain 18 happiness units by sitting next to George.
+Frank would lose 56 happiness units by sitting next to Mallory.
+George would gain 45 happiness units by sitting next to Alice.
+George would gain 76 happiness units by sitting next to Bob.
+George would gain 63 happiness units by sitting next to Carol.
+George would gain 54 happiness units by sitting next to David.
+George would gain 54 happiness units by sitting next to Eric.
+George would gain 30 happiness units by sitting next to Frank.
+George would gain 7 happiness units by sitting next to Mallory.
+Mallory would gain 31 happiness units by sitting next to Alice.
+Mallory would lose 32 happiness units by sitting next to Bob.
+Mallory would gain 95 happiness units by sitting next to Carol.
+Mallory would gain 91 happiness units by sitting next to David.
+Mallory would lose 66 happiness units by sitting next to Eric.
+Mallory would lose 75 happiness units by sitting next to Frank.
+Mallory would lose 99 happiness units by sitting next to George.
--- a/2015/day-13/solution.py
+++ b/2015/day-13/solution.py
@@ -0,0 +1,51 @@
+from __future__ import print_function
+import fileinput
+import re
+from itertools import permutations
+
+linePattern = re.compile(r"(\w+) would (gain|lose) (\d+) happiness units by sitting next to (\w+)\.")
+
+ratings = {}
+
+
+# Read the input by regex
+for line in fileinput.input():
+    match = linePattern.match(line)
+    person = match.group(1)
+    if person not in ratings:
+        ratings[person] = {}
+
+    value = int(match.group(3))
+    if match.group(2) == "lose":
+        value *= -1
+
+    target = match.group(4)
+    ratings[person][target] = value
+
+maxHappiness = 0
+maxWithMe = 0
+
+# Compute happiness with everyone present
+for permutation in permutations(list(ratings.keys())):
+    happiness = 0
+    withMe = 0
+
+    for i in range(len(permutation)):
+        target = permutation[i]
+        neighbour1 = permutation[(i + 1) % len(permutation)]
+        neighbour2 = permutation[(i - 1 + len(permutation)) % len(permutation)]
+
+        happiness += ratings[target][neighbour1]
+        if i < len(permutation) - 1:
+            withMe += ratings[target][neighbour1]
+
+        happiness += ratings[target][neighbour2]
+        if i > 0:
+            withMe += ratings[target][neighbour2]
+
+    maxHappiness = max(maxHappiness, happiness)
+    maxWithMe = max(maxWithMe, withMe)
+
+
+print(maxHappiness, maxWithMe)
+
--- a/2015/day-14/input.txt
+++ b/2015/day-14/input.txt
@@ -0,0 +1,9 @@
+Vixen can fly 8 km/s for 8 seconds, but then must rest for 53 seconds.
+Blitzen can fly 13 km/s for 4 seconds, but then must rest for 49 seconds.
+Rudolph can fly 20 km/s for 7 seconds, but then must rest for 132 seconds.
+Cupid can fly 12 km/s for 4 seconds, but then must rest for 43 seconds.
+Donner can fly 9 km/s for 5 seconds, but then must rest for 38 seconds.
+Dasher can fly 10 km/s for 4 seconds, but then must rest for 37 seconds.
+Comet can fly 3 km/s for 37 seconds, but then must rest for 76 seconds.
+Prancer can fly 9 km/s for 12 seconds, but then must rest for 97 seconds.
+Dancer can fly 37 km/s for 1 seconds, but then must rest for 36 seconds.
--- a/2015/day-14/solution.py
+++ b/2015/day-14/solution.py
@@ -0,0 +1,34 @@
+from __future__ import division, print_function
+import fileinput
+import re
+import itertools
+from collections import defaultdict
+
+pattern = re.compile("(\w+) can fly (\d+) km\/s for (\d+) seconds, but then must rest for (\d+) seconds.")
+
+runners = defaultdict(lambda: 0)
+runnerData = {}
+runnerPoints = defaultdict(lambda: 0)
+
+totalTime = 2503
+
+for line in fileinput.input():
+    match = pattern.search(line)
+    reindeer, speed, runtime, resttime = match.group(1, 2, 3, 4)
+    speed = int(speed)
+    runtime = int(runtime)
+    resttime = int(resttime)
+
+    runnerData[reindeer] = itertools.cycle([speed] * runtime + [0] * resttime)
+
+for _ in range(totalTime):
+    for i in runnerData:
+        runners[i] += next(runnerData[i])
+
+    best = max(runners.values())
+    for i in runners:
+        if runners[i] == best:
+            runnerPoints[i] += 1
+
+print("Fastest runner covered", max(runners.values()))
+print("Highest score is", max(runnerPoints.values()))
--- a/2015/day-15/input.txt
+++ b/2015/day-15/input.txt
@@ -0,0 +1,4 @@
+Sugar: capacity 3, durability 0, flavor 0, texture -3, calories 2
+Sprinkles: capacity -3, durability 3, flavor 0, texture 0, calories 9
+Candy: capacity -1, durability 0, flavor 4, texture 0, calories 1
+Chocolate: capacity 0, durability 0, flavor -2, texture 2, calories 8
--- a/2015/day-15/solution.py
+++ b/2015/day-15/solution.py
@@ -0,0 +1,47 @@
+from __future__ import print_function
+import fileinput
+import re
+from operator import mul
+from functools import reduce
+
+pattern = re.compile(r"(\w+): capacity (-?\d+), durability (-?\d+), flavor (-?\d+), texture (-?\d+), calories (-?\d+)")
+
+ingredients = []
+calories = []
+
+def computeScore(amounts):
+    scores = [sum(ingredients[idx][x] * value for idx, value in enumerate(amounts)) for x in range(4)]
+
+    return reduce(mul, [max(x, 0) for x in scores], 1)
+
+def computeCalories(amounts):
+    return sum(a * b for a, b in zip(calories, amounts))
+
+
+def computeMax(ingredient, budget, currentAmounts):
+    budgetLeft = budget - sum(currentAmounts[:ingredient])
+
+    if ingredient == len(ingredients) - 1:
+        currentAmounts[ingredient] = budgetLeft
+        score = computeScore(currentAmounts)
+        if computeCalories(currentAmounts) == 500:
+            return score, score
+
+        return score, None
+
+    results = []
+    resultsCorrect = [0]
+    for n in range(budgetLeft + 1):
+        currentAmounts[ingredient] = n
+        general, correct = computeMax(ingredient + 1, budget, currentAmounts)
+        results.append(general)
+        resultsCorrect.append(correct)
+
+    return max(results), max(x for x in resultsCorrect if x is not None)
+
+for line in fileinput.input():
+    match = pattern.match(line)
+    ingredients.append([int(x) for x in match.group(2, 3, 4, 5)])
+    calories.append(int(match.group(6)))
+
+print(computeMax(0, 100, [0] * len(ingredients)))
--- a/2015/day-16/input.txt
+++ b/2015/day-16/input.txt
@@ -0,0 +1,500 @@
+Sue 1: cars: 9, akitas: 3, goldfish: 0
+Sue 2: akitas: 9, children: 3, samoyeds: 9
+Sue 3: trees: 6, cars: 6, children: 4
+Sue 4: trees: 4, vizslas: 4, goldfish: 9
+Sue 5: akitas: 9, vizslas: 7, cars: 5
+Sue 6: vizslas: 6, goldfish: 6, akitas: 3
+Sue 7: pomeranians: 5, samoyeds: 0, perfumes: 10
+Sue 8: cars: 10, pomeranians: 7, goldfish: 8
+Sue 9: trees: 2, vizslas: 7, samoyeds: 6
+Sue 10: perfumes: 5, pomeranians: 4, children: 9
+Sue 11: vizslas: 5, perfumes: 8, cars: 10
+Sue 12: children: 10, cars: 6, perfumes: 5
+Sue 13: cats: 4, samoyeds: 7, pomeranians: 8
+Sue 14: perfumes: 6, goldfish: 10, children: 7
+Sue 15: perfumes: 4, pomeranians: 3, cars: 6
+Sue 16: perfumes: 7, cars: 9, pomeranians: 6
+Sue 17: goldfish: 3, cars: 6, vizslas: 7
+Sue 18: perfumes: 6, cars: 7, goldfish: 3
+Sue 19: trees: 0, akitas: 3, pomeranians: 8
+Sue 20: goldfish: 6, trees: 2, akitas: 6
+Sue 21: pomeranians: 9, akitas: 9, samoyeds: 9
+Sue 22: vizslas: 2, cars: 9, perfumes: 5
+Sue 23: goldfish: 10, samoyeds: 8, children: 9
+Sue 24: akitas: 4, goldfish: 1, vizslas: 5
+Sue 25: goldfish: 10, trees: 8, perfumes: 6
+Sue 26: vizslas: 5, akitas: 8, trees: 1
+Sue 27: trees: 3, cars: 6, perfumes: 2
+Sue 28: goldfish: 8, trees: 7, akitas: 10
+Sue 29: children: 5, trees: 1, goldfish: 10
+Sue 30: vizslas: 3, perfumes: 8, akitas: 3
+Sue 31: cars: 6, children: 10, perfumes: 7
+Sue 32: cars: 10, perfumes: 3, goldfish: 10
+Sue 33: perfumes: 9, vizslas: 3, akitas: 4
+Sue 34: perfumes: 10, vizslas: 7, children: 8
+Sue 35: cars: 5, perfumes: 5, vizslas: 9
+Sue 36: trees: 9, cars: 9, akitas: 7
+Sue 37: samoyeds: 9, perfumes: 2, cars: 10
+Sue 38: akitas: 7, cars: 5, trees: 5
+Sue 39: goldfish: 8, trees: 9, cars: 10
+Sue 40: trees: 0, cats: 1, pomeranians: 1
+Sue 41: pomeranians: 6, perfumes: 9, samoyeds: 1
+Sue 42: vizslas: 6, akitas: 3, pomeranians: 1
+Sue 43: vizslas: 2, perfumes: 3, pomeranians: 6
+Sue 44: akitas: 5, pomeranians: 0, vizslas: 10
+Sue 45: vizslas: 4, goldfish: 1, cars: 5
+Sue 46: cars: 4, vizslas: 8, cats: 0
+Sue 47: cats: 5, children: 8, pomeranians: 2
+Sue 48: vizslas: 3, perfumes: 6, cats: 0
+Sue 49: akitas: 7, perfumes: 0, trees: 7
+Sue 50: trees: 4, akitas: 10, vizslas: 2
+Sue 51: goldfish: 10, cars: 9, trees: 4
+Sue 52: cars: 5, children: 9, perfumes: 0
+Sue 53: vizslas: 5, cars: 3, cats: 8
+Sue 54: cars: 5, akitas: 1, goldfish: 10
+Sue 55: akitas: 10, vizslas: 2, cars: 6
+Sue 56: cats: 6, trees: 0, cars: 4
+Sue 57: vizslas: 1, akitas: 1, samoyeds: 7
+Sue 58: samoyeds: 6, vizslas: 1, akitas: 7
+Sue 59: akitas: 9, cars: 8, vizslas: 1
+Sue 60: cars: 6, vizslas: 7, goldfish: 0
+Sue 61: pomeranians: 5, akitas: 6, vizslas: 2
+Sue 62: samoyeds: 2, cats: 8, goldfish: 7
+Sue 63: vizslas: 10, goldfish: 7, samoyeds: 9
+Sue 64: perfumes: 2, trees: 1, akitas: 6
+Sue 65: cars: 8, perfumes: 10, vizslas: 9
+Sue 66: akitas: 8, vizslas: 8, perfumes: 8
+Sue 67: goldfish: 7, cars: 9, samoyeds: 9
+Sue 68: perfumes: 2, children: 7, akitas: 1
+Sue 69: perfumes: 7, vizslas: 9, akitas: 1
+Sue 70: samoyeds: 3, vizslas: 1, trees: 1
+Sue 71: vizslas: 8, goldfish: 7, trees: 9
+Sue 72: goldfish: 8, cars: 6, trees: 9
+Sue 73: perfumes: 5, cars: 10, samoyeds: 7
+Sue 74: pomeranians: 4, perfumes: 3, cars: 5
+Sue 75: samoyeds: 1, perfumes: 1, pomeranians: 1
+Sue 76: goldfish: 4, cats: 6, akitas: 7
+Sue 77: perfumes: 5, akitas: 4, vizslas: 8
+Sue 78: perfumes: 4, cats: 3, children: 4
+Sue 79: vizslas: 5, pomeranians: 9, samoyeds: 7
+Sue 80: cars: 3, samoyeds: 5, pomeranians: 7
+Sue 81: vizslas: 2, samoyeds: 4, perfumes: 2
+Sue 82: trees: 1, akitas: 10, vizslas: 9
+Sue 83: vizslas: 0, akitas: 2, samoyeds: 5
+Sue 84: perfumes: 5, vizslas: 7, children: 8
+Sue 85: cats: 3, children: 2, trees: 0
+Sue 86: cars: 3, perfumes: 2, goldfish: 2
+Sue 87: trees: 1, akitas: 7, vizslas: 0
+Sue 88: trees: 1, akitas: 2, samoyeds: 1
+Sue 89: cars: 4, vizslas: 8, akitas: 1
+Sue 90: perfumes: 5, cats: 3, vizslas: 0
+Sue 91: samoyeds: 7, cats: 6, goldfish: 8
+Sue 92: samoyeds: 10, cats: 0, cars: 7
+Sue 93: cars: 6, akitas: 7, samoyeds: 2
+Sue 94: perfumes: 0, goldfish: 6, trees: 9
+Sue 95: cars: 6, pomeranians: 2, samoyeds: 8
+Sue 96: cars: 2, trees: 9, samoyeds: 4
+Sue 97: goldfish: 5, trees: 1, children: 0
+Sue 98: akitas: 9, goldfish: 7, children: 6
+Sue 99: goldfish: 9, akitas: 0, pomeranians: 0
+Sue 100: samoyeds: 6, children: 8, vizslas: 5
+Sue 101: vizslas: 6, cars: 5, goldfish: 4
+Sue 102: vizslas: 6, akitas: 2, perfumes: 6
+Sue 103: samoyeds: 3, akitas: 7, children: 4
+Sue 104: cars: 3, perfumes: 10, cats: 6
+Sue 105: vizslas: 9, pomeranians: 0, cars: 1
+Sue 106: cats: 6, samoyeds: 8, pomeranians: 5
+Sue 107: cars: 7, trees: 4, akitas: 10
+Sue 108: perfumes: 3, vizslas: 1, goldfish: 9
+Sue 109: trees: 6, cars: 8, goldfish: 5
+Sue 110: pomeranians: 2, children: 1, vizslas: 7
+Sue 111: akitas: 0, vizslas: 8, cars: 0
+Sue 112: goldfish: 3, vizslas: 6, akitas: 2
+Sue 113: akitas: 10, pomeranians: 7, perfumes: 7
+Sue 114: cars: 10, cats: 2, vizslas: 8
+Sue 115: akitas: 8, trees: 1, vizslas: 2
+Sue 116: vizslas: 2, akitas: 7, perfumes: 1
+Sue 117: goldfish: 0, vizslas: 10, trees: 9
+Sue 118: trees: 3, cars: 0, goldfish: 0
+Sue 119: perfumes: 7, goldfish: 5, trees: 9
+Sue 120: children: 9, vizslas: 3, trees: 5
+Sue 121: vizslas: 1, goldfish: 7, akitas: 10
+Sue 122: perfumes: 1, cars: 6, trees: 1
+Sue 123: akitas: 2, vizslas: 0, goldfish: 7
+Sue 124: vizslas: 10, pomeranians: 7, akitas: 0
+Sue 125: perfumes: 4, cats: 5, vizslas: 2
+Sue 126: cars: 6, samoyeds: 8, akitas: 3
+Sue 127: trees: 9, goldfish: 7, akitas: 9
+Sue 128: cars: 8, trees: 0, perfumes: 2
+Sue 129: pomeranians: 7, vizslas: 2, perfumes: 6
+Sue 130: vizslas: 9, pomeranians: 3, trees: 6
+Sue 131: vizslas: 7, cars: 9, perfumes: 1
+Sue 132: akitas: 2, pomeranians: 9, vizslas: 7
+Sue 133: trees: 9, pomeranians: 10, samoyeds: 0
+Sue 134: children: 4, akitas: 10, perfumes: 4
+Sue 135: vizslas: 1, cats: 1, trees: 8
+Sue 136: samoyeds: 7, cars: 8, goldfish: 5
+Sue 137: perfumes: 0, children: 1, pomeranians: 10
+Sue 138: vizslas: 4, perfumes: 5, cars: 5
+Sue 139: trees: 2, perfumes: 8, goldfish: 0
+Sue 140: cars: 10, akitas: 5, goldfish: 7
+Sue 141: children: 4, trees: 3, goldfish: 8
+Sue 142: cars: 8, perfumes: 6, trees: 7
+Sue 143: akitas: 6, goldfish: 0, trees: 10
+Sue 144: akitas: 7, pomeranians: 10, perfumes: 10
+Sue 145: trees: 10, vizslas: 3, goldfish: 4
+Sue 146: samoyeds: 4, akitas: 3, perfumes: 6
+Sue 147: akitas: 8, perfumes: 2, pomeranians: 10
+Sue 148: cars: 2, perfumes: 0, goldfish: 8
+Sue 149: goldfish: 6, akitas: 7, perfumes: 6
+Sue 150: cars: 2, pomeranians: 5, perfumes: 4
+Sue 151: goldfish: 1, cars: 5, trees: 0
+Sue 152: pomeranians: 4, cars: 7, children: 1
+Sue 153: goldfish: 8, cars: 1, children: 10
+Sue 154: cars: 6, perfumes: 8, trees: 1
+Sue 155: akitas: 4, perfumes: 6, pomeranians: 2
+Sue 156: pomeranians: 5, cars: 4, akitas: 1
+Sue 157: cats: 5, cars: 9, goldfish: 8
+Sue 158: vizslas: 5, samoyeds: 1, children: 7
+Sue 159: vizslas: 1, perfumes: 3, akitas: 1
+Sue 160: goldfish: 10, pomeranians: 9, perfumes: 5
+Sue 161: samoyeds: 3, trees: 7, cars: 2
+Sue 162: cars: 2, pomeranians: 1, vizslas: 6
+Sue 163: vizslas: 3, perfumes: 5, akitas: 6
+Sue 164: vizslas: 1, trees: 0, akitas: 5
+Sue 165: vizslas: 5, cars: 6, pomeranians: 8
+Sue 166: cars: 10, perfumes: 2, trees: 9
+Sue 167: cars: 10, pomeranians: 6, perfumes: 4
+Sue 168: akitas: 7, trees: 10, goldfish: 7
+Sue 169: akitas: 1, perfumes: 10, cars: 10
+Sue 170: akitas: 5, samoyeds: 8, vizslas: 6
+Sue 171: children: 3, akitas: 2, vizslas: 3
+Sue 172: goldfish: 5, vizslas: 5, perfumes: 9
+Sue 173: perfumes: 5, goldfish: 10, trees: 5
+Sue 174: akitas: 5, vizslas: 2, children: 7
+Sue 175: perfumes: 5, cars: 7, samoyeds: 2
+Sue 176: cars: 8, vizslas: 10, akitas: 7
+Sue 177: perfumes: 7, children: 8, goldfish: 7
+Sue 178: cars: 1, pomeranians: 9, samoyeds: 0
+Sue 179: perfumes: 6, cars: 2, trees: 6
+Sue 180: trees: 3, vizslas: 7, children: 3
+Sue 181: vizslas: 8, samoyeds: 2, trees: 9
+Sue 182: perfumes: 3, cats: 1, children: 5
+Sue 183: akitas: 9, cats: 6, children: 3
+Sue 184: pomeranians: 9, cars: 6, perfumes: 8
+Sue 185: vizslas: 9, trees: 0, akitas: 9
+Sue 186: perfumes: 6, cars: 5, goldfish: 5
+Sue 187: perfumes: 4, cats: 7, vizslas: 2
+Sue 188: akitas: 7, cars: 4, children: 10
+Sue 189: akitas: 0, goldfish: 7, vizslas: 5
+Sue 190: akitas: 5, cars: 5, cats: 6
+Sue 191: cars: 6, children: 0, perfumes: 3
+Sue 192: cats: 2, perfumes: 10, goldfish: 7
+Sue 193: trees: 1, perfumes: 0, cars: 8
+Sue 194: perfumes: 9, children: 4, cats: 6
+Sue 195: akitas: 7, trees: 3, goldfish: 6
+Sue 196: goldfish: 8, cars: 8, samoyeds: 0
+Sue 197: cats: 0, akitas: 10, vizslas: 0
+Sue 198: goldfish: 1, perfumes: 3, cars: 8
+Sue 199: akitas: 10, vizslas: 5, samoyeds: 6
+Sue 200: pomeranians: 9, goldfish: 9, samoyeds: 7
+Sue 201: samoyeds: 0, goldfish: 7, akitas: 6
+Sue 202: vizslas: 0, goldfish: 2, akitas: 1
+Sue 203: goldfish: 3, children: 0, vizslas: 8
+Sue 204: cars: 8, trees: 2, perfumes: 2
+Sue 205: cars: 4, perfumes: 5, goldfish: 8
+Sue 206: vizslas: 3, trees: 2, akitas: 1
+Sue 207: cars: 7, goldfish: 5, trees: 1
+Sue 208: goldfish: 1, cars: 6, vizslas: 8
+Sue 209: cats: 4, trees: 1, children: 0
+Sue 210: cats: 10, children: 0, perfumes: 0
+Sue 211: cars: 4, pomeranians: 7, samoyeds: 5
+Sue 212: cars: 2, pomeranians: 10, trees: 1
+Sue 213: trees: 10, cats: 5, cars: 10
+Sue 214: perfumes: 5, trees: 1, vizslas: 1
+Sue 215: akitas: 10, vizslas: 8, samoyeds: 8
+Sue 216: vizslas: 2, cats: 5, pomeranians: 3
+Sue 217: akitas: 10, perfumes: 0, cats: 10
+Sue 218: trees: 8, cats: 5, vizslas: 2
+Sue 219: goldfish: 10, perfumes: 8, children: 2
+Sue 220: samoyeds: 9, trees: 8, vizslas: 7
+Sue 221: children: 7, trees: 6, cars: 6
+Sue 222: cats: 4, akitas: 5, pomeranians: 0
+Sue 223: trees: 8, goldfish: 2, perfumes: 8
+Sue 224: pomeranians: 9, cars: 8, akitas: 5
+Sue 225: akitas: 10, vizslas: 0, trees: 2
+Sue 226: akitas: 8, cats: 6, cars: 7
+Sue 227: trees: 1, akitas: 3, goldfish: 4
+Sue 228: pomeranians: 6, cats: 3, goldfish: 3
+Sue 229: trees: 10, perfumes: 3, vizslas: 7
+Sue 230: perfumes: 8, cars: 7, akitas: 0
+Sue 231: perfumes: 10, goldfish: 4, cars: 6
+Sue 232: goldfish: 7, trees: 3, cats: 2
+Sue 233: perfumes: 6, trees: 4, akitas: 4
+Sue 234: goldfish: 9, cats: 4, cars: 7
+Sue 235: pomeranians: 6, vizslas: 0, akitas: 6
+Sue 236: samoyeds: 5, cars: 5, children: 4
+Sue 237: vizslas: 10, cars: 4, goldfish: 4
+Sue 238: goldfish: 3, samoyeds: 7, akitas: 2
+Sue 239: cats: 8, children: 2, vizslas: 7
+Sue 240: cars: 9, perfumes: 4, trees: 9
+Sue 241: trees: 8, vizslas: 2, goldfish: 5
+Sue 242: cars: 6, trees: 3, vizslas: 3
+Sue 243: cats: 6, children: 7, cars: 4
+Sue 244: cats: 10, perfumes: 2, goldfish: 7
+Sue 245: akitas: 8, cats: 10, perfumes: 8
+Sue 246: vizslas: 8, akitas: 5, perfumes: 10
+Sue 247: goldfish: 2, vizslas: 5, akitas: 7
+Sue 248: akitas: 3, perfumes: 0, trees: 10
+Sue 249: cats: 4, vizslas: 5, pomeranians: 6
+Sue 250: children: 3, vizslas: 7, perfumes: 2
+Sue 251: cars: 0, pomeranians: 10, perfumes: 0
+Sue 252: akitas: 0, goldfish: 9, cars: 6
+Sue 253: perfumes: 7, cars: 4, samoyeds: 5
+Sue 254: akitas: 9, trees: 10, cars: 4
+Sue 255: samoyeds: 10, children: 6, akitas: 7
+Sue 256: trees: 8, goldfish: 8, perfumes: 8
+Sue 257: goldfish: 3, akitas: 2, perfumes: 6
+Sue 258: cats: 7, trees: 0, vizslas: 1
+Sue 259: perfumes: 7, cars: 7, akitas: 7
+Sue 260: goldfish: 0, vizslas: 0, samoyeds: 2
+Sue 261: vizslas: 2, children: 2, cats: 3
+Sue 262: vizslas: 2, pomeranians: 9, samoyeds: 3
+Sue 263: cats: 1, akitas: 3, vizslas: 1
+Sue 264: pomeranians: 10, trees: 2, goldfish: 7
+Sue 265: samoyeds: 5, trees: 7, perfumes: 4
+Sue 266: perfumes: 10, cars: 1, pomeranians: 3
+Sue 267: trees: 6, goldfish: 1, cars: 0
+Sue 268: cars: 6, samoyeds: 4, pomeranians: 5
+Sue 269: goldfish: 3, vizslas: 3, akitas: 3
+Sue 270: children: 5, cats: 0, cars: 4
+Sue 271: goldfish: 3, perfumes: 8, pomeranians: 7
+Sue 272: samoyeds: 6, cars: 7, perfumes: 10
+Sue 273: trees: 4, cars: 2, vizslas: 7
+Sue 274: samoyeds: 10, perfumes: 9, goldfish: 6
+Sue 275: cars: 4, trees: 2, perfumes: 7
+Sue 276: akitas: 3, perfumes: 9, cars: 9
+Sue 277: akitas: 8, vizslas: 2, cats: 6
+Sue 278: trees: 5, goldfish: 7, akitas: 3
+Sue 279: perfumes: 9, cars: 8, vizslas: 2
+Sue 280: trees: 3, vizslas: 0, children: 0
+Sue 281: cars: 7, trees: 2, cats: 5
+Sue 282: vizslas: 4, cars: 10, cats: 3
+Sue 283: akitas: 10, cats: 3, samoyeds: 9
+Sue 284: trees: 7, children: 5, goldfish: 6
+Sue 285: cars: 2, perfumes: 5, cats: 7
+Sue 286: samoyeds: 5, trees: 10, goldfish: 6
+Sue 287: goldfish: 10, perfumes: 4, trees: 7
+Sue 288: vizslas: 9, trees: 9, perfumes: 0
+Sue 289: trees: 4, goldfish: 9, vizslas: 8
+Sue 290: vizslas: 3, cars: 3, trees: 2
+Sue 291: goldfish: 2, akitas: 2, trees: 2
+Sue 292: children: 1, cars: 0, vizslas: 5
+Sue 293: trees: 5, akitas: 4, goldfish: 6
+Sue 294: akitas: 3, vizslas: 7, pomeranians: 5
+Sue 295: goldfish: 10, vizslas: 3, trees: 1
+Sue 296: cars: 2, trees: 1, akitas: 0
+Sue 297: akitas: 10, vizslas: 6, samoyeds: 2
+Sue 298: children: 5, trees: 1, samoyeds: 9
+Sue 299: perfumes: 9, trees: 6, vizslas: 1
+Sue 300: akitas: 7, pomeranians: 6, vizslas: 6
+Sue 301: cats: 7, children: 6, vizslas: 7
+Sue 302: trees: 2, vizslas: 7, samoyeds: 4
+Sue 303: goldfish: 0, samoyeds: 10, cars: 4
+Sue 304: pomeranians: 9, children: 3, vizslas: 5
+Sue 305: akitas: 8, vizslas: 4, cars: 5
+Sue 306: akitas: 0, perfumes: 2, pomeranians: 10
+Sue 307: akitas: 9, cars: 0, trees: 2
+Sue 308: vizslas: 10, goldfish: 8, akitas: 6
+Sue 309: trees: 0, cats: 6, perfumes: 2
+Sue 310: vizslas: 10, cars: 1, trees: 4
+Sue 311: goldfish: 8, perfumes: 6, cats: 3
+Sue 312: goldfish: 0, children: 1, akitas: 2
+Sue 313: pomeranians: 10, trees: 6, samoyeds: 6
+Sue 314: vizslas: 5, akitas: 4, pomeranians: 2
+Sue 315: goldfish: 7, trees: 0, akitas: 5
+Sue 316: goldfish: 4, vizslas: 5, cars: 7
+Sue 317: perfumes: 7, cats: 10, cars: 4
+Sue 318: samoyeds: 10, cars: 9, trees: 7
+Sue 319: pomeranians: 8, vizslas: 6, cars: 3
+Sue 320: cars: 4, cats: 9, akitas: 4
+Sue 321: cars: 6, trees: 2, perfumes: 6
+Sue 322: goldfish: 1, cats: 2, perfumes: 4
+Sue 323: akitas: 6, cats: 5, cars: 8
+Sue 324: cats: 4, vizslas: 9, akitas: 0
+Sue 325: children: 8, samoyeds: 9, trees: 4
+Sue 326: vizslas: 2, samoyeds: 10, perfumes: 7
+Sue 327: goldfish: 7, pomeranians: 4, akitas: 10
+Sue 328: perfumes: 8, cats: 4, akitas: 10
+Sue 329: trees: 0, cars: 9, goldfish: 3
+Sue 330: trees: 5, samoyeds: 7, perfumes: 8
+Sue 331: cars: 4, perfumes: 2, goldfish: 0
+Sue 332: vizslas: 4, pomeranians: 7, akitas: 1
+Sue 333: akitas: 4, goldfish: 3, perfumes: 0
+Sue 334: samoyeds: 3, akitas: 10, vizslas: 0
+Sue 335: goldfish: 1, akitas: 7, vizslas: 6
+Sue 336: perfumes: 1, goldfish: 1, pomeranians: 8
+Sue 337: children: 5, cars: 4, cats: 4
+Sue 338: vizslas: 5, cars: 10, cats: 3
+Sue 339: trees: 2, goldfish: 3, cars: 1
+Sue 340: trees: 10, goldfish: 6, perfumes: 2
+Sue 341: akitas: 5, trees: 6, cats: 3
+Sue 342: cars: 10, children: 8, goldfish: 0
+Sue 343: cats: 2, akitas: 0, pomeranians: 4
+Sue 344: perfumes: 1, vizslas: 3, cars: 3
+Sue 345: samoyeds: 8, cats: 5, perfumes: 8
+Sue 346: cars: 5, akitas: 10, trees: 2
+Sue 347: vizslas: 9, akitas: 9, cars: 3
+Sue 348: cars: 3, perfumes: 1, pomeranians: 9
+Sue 349: akitas: 1, cars: 4, perfumes: 0
+Sue 350: perfumes: 8, vizslas: 2, trees: 6
+Sue 351: pomeranians: 5, akitas: 9, cats: 8
+Sue 352: pomeranians: 8, vizslas: 3, goldfish: 10
+Sue 353: trees: 2, pomeranians: 0, goldfish: 6
+Sue 354: cats: 5, akitas: 7, goldfish: 6
+Sue 355: goldfish: 6, children: 4, trees: 10
+Sue 356: children: 1, trees: 3, akitas: 7
+Sue 357: trees: 2, samoyeds: 10, goldfish: 3
+Sue 358: samoyeds: 10, cats: 0, goldfish: 0
+Sue 359: perfumes: 3, children: 6, pomeranians: 1
+Sue 360: cars: 10, pomeranians: 1, samoyeds: 5
+Sue 361: samoyeds: 9, pomeranians: 7, perfumes: 6
+Sue 362: goldfish: 6, trees: 8, perfumes: 9
+Sue 363: samoyeds: 10, pomeranians: 9, children: 10
+Sue 364: perfumes: 3, goldfish: 7, cars: 9
+Sue 365: cats: 3, children: 4, samoyeds: 8
+Sue 366: trees: 0, cars: 10, vizslas: 10
+Sue 367: pomeranians: 10, children: 8, perfumes: 2
+Sue 368: cars: 5, vizslas: 0, samoyeds: 3
+Sue 369: trees: 1, goldfish: 8, cars: 8
+Sue 370: vizslas: 0, cars: 2, perfumes: 5
+Sue 371: trees: 2, cars: 3, vizslas: 8
+Sue 372: trees: 10, children: 9, cats: 1
+Sue 373: pomeranians: 3, perfumes: 1, vizslas: 0
+Sue 374: vizslas: 0, perfumes: 6, trees: 0
+Sue 375: vizslas: 7, pomeranians: 1, akitas: 10
+Sue 376: vizslas: 8, trees: 2, cars: 10
+Sue 377: perfumes: 9, cats: 5, goldfish: 5
+Sue 378: cats: 0, akitas: 10, perfumes: 9
+Sue 379: cars: 4, akitas: 1, trees: 1
+Sue 380: cars: 4, perfumes: 5, trees: 3
+Sue 381: goldfish: 3, akitas: 5, samoyeds: 9
+Sue 382: goldfish: 7, perfumes: 5, trees: 5
+Sue 383: akitas: 4, cats: 6, cars: 8
+Sue 384: children: 6, goldfish: 10, akitas: 7
+Sue 385: akitas: 7, vizslas: 5, perfumes: 10
+Sue 386: children: 7, vizslas: 10, akitas: 10
+Sue 387: goldfish: 6, akitas: 7, trees: 2
+Sue 388: vizslas: 6, trees: 1, akitas: 2
+Sue 389: cars: 5, vizslas: 3, akitas: 7
+Sue 390: vizslas: 4, cats: 8, perfumes: 7
+Sue 391: akitas: 3, trees: 0, children: 2
+Sue 392: cats: 7, cars: 3, children: 9
+Sue 393: trees: 10, vizslas: 3, goldfish: 7
+Sue 394: perfumes: 0, goldfish: 7, akitas: 4
+Sue 395: cats: 6, cars: 7, vizslas: 0
+Sue 396: vizslas: 4, perfumes: 6, goldfish: 5
+Sue 397: pomeranians: 8, trees: 1, akitas: 9
+Sue 398: goldfish: 7, pomeranians: 6, samoyeds: 9
+Sue 399: perfumes: 10, cars: 1, trees: 8
+Sue 400: trees: 0, goldfish: 9, children: 6
+Sue 401: trees: 1, cars: 6, pomeranians: 8
+Sue 402: perfumes: 9, cars: 0, vizslas: 10
+Sue 403: samoyeds: 4, akitas: 1, vizslas: 9
+Sue 404: perfumes: 0, trees: 2, cars: 4
+Sue 405: akitas: 0, perfumes: 5, samoyeds: 4
+Sue 406: akitas: 8, vizslas: 6, children: 2
+Sue 407: children: 1, trees: 8, goldfish: 10
+Sue 408: pomeranians: 4, trees: 10, cars: 9
+Sue 409: perfumes: 5, vizslas: 5, akitas: 4
+Sue 410: trees: 1, akitas: 10, vizslas: 6
+Sue 411: samoyeds: 0, goldfish: 9, perfumes: 7
+Sue 412: goldfish: 7, samoyeds: 10, trees: 1
+Sue 413: samoyeds: 0, pomeranians: 10, vizslas: 6
+Sue 414: children: 2, cars: 10, samoyeds: 2
+Sue 415: trees: 2, goldfish: 8, cars: 0
+Sue 416: samoyeds: 4, goldfish: 9, trees: 2
+Sue 417: trees: 8, akitas: 10, perfumes: 3
+Sue 418: samoyeds: 9, goldfish: 2, cars: 1
+Sue 419: akitas: 2, perfumes: 8, trees: 2
+Sue 420: children: 3, goldfish: 6, perfumes: 5
+Sue 421: akitas: 8, perfumes: 2, samoyeds: 6
+Sue 422: vizslas: 10, akitas: 4, pomeranians: 3
+Sue 423: cats: 8, perfumes: 3, trees: 4
+Sue 424: cars: 2, children: 4, pomeranians: 8
+Sue 425: pomeranians: 4, samoyeds: 2, goldfish: 4
+Sue 426: perfumes: 6, cars: 4, goldfish: 4
+Sue 427: akitas: 0, goldfish: 7, perfumes: 5
+Sue 428: perfumes: 4, cars: 3, akitas: 5
+Sue 429: trees: 0, vizslas: 0, goldfish: 1
+Sue 430: perfumes: 4, vizslas: 2, cars: 7
+Sue 431: goldfish: 7, pomeranians: 8, trees: 0
+Sue 432: goldfish: 7, children: 9, trees: 3
+Sue 433: akitas: 1, vizslas: 10, trees: 2
+Sue 434: perfumes: 2, cars: 4, goldfish: 10
+Sue 435: pomeranians: 6, vizslas: 9, trees: 1
+Sue 436: cars: 9, trees: 0, goldfish: 0
+Sue 437: trees: 1, goldfish: 1, vizslas: 8
+Sue 438: goldfish: 7, samoyeds: 8, children: 2
+Sue 439: children: 1, cats: 7, vizslas: 8
+Sue 440: cats: 2, pomeranians: 6, goldfish: 4
+Sue 441: perfumes: 7, cats: 3, vizslas: 6
+Sue 442: akitas: 4, samoyeds: 5, cars: 2
+Sue 443: akitas: 3, perfumes: 3, cats: 9
+Sue 444: perfumes: 10, akitas: 6, trees: 0
+Sue 445: cars: 5, children: 9, perfumes: 8
+Sue 446: vizslas: 10, cars: 3, perfumes: 5
+Sue 447: children: 9, perfumes: 1, cars: 10
+Sue 448: akitas: 0, goldfish: 8, trees: 3
+Sue 449: cars: 7, akitas: 8, children: 3
+Sue 450: cars: 4, akitas: 9, cats: 0
+Sue 451: perfumes: 4, samoyeds: 5, goldfish: 6
+Sue 452: perfumes: 10, akitas: 1, cars: 7
+Sue 453: trees: 1, goldfish: 3, vizslas: 6
+Sue 454: goldfish: 8, pomeranians: 6, trees: 10
+Sue 455: akitas: 5, vizslas: 8, goldfish: 10
+Sue 456: cats: 5, trees: 4, samoyeds: 0
+Sue 457: perfumes: 8, cars: 0, cats: 3
+Sue 458: akitas: 1, trees: 10, vizslas: 2
+Sue 459: vizslas: 6, akitas: 3, children: 10
+Sue 460: perfumes: 7, trees: 9, goldfish: 8
+Sue 461: children: 6, vizslas: 4, perfumes: 5
+Sue 462: vizslas: 6, akitas: 8, perfumes: 9
+Sue 463: goldfish: 8, cars: 4, trees: 10
+Sue 464: pomeranians: 8, cars: 5, vizslas: 0
+Sue 465: cats: 10, goldfish: 7, akitas: 1
+Sue 466: cats: 2, children: 1, cars: 6
+Sue 467: perfumes: 3, samoyeds: 6, cars: 0
+Sue 468: samoyeds: 10, pomeranians: 6, trees: 2
+Sue 469: children: 2, perfumes: 2, pomeranians: 4
+Sue 470: cats: 1, perfumes: 5, vizslas: 9
+Sue 471: vizslas: 5, perfumes: 2, akitas: 7
+Sue 472: samoyeds: 8, goldfish: 6, cats: 1
+Sue 473: goldfish: 10, perfumes: 9, cars: 4
+Sue 474: samoyeds: 0, cars: 4, vizslas: 4
+Sue 475: trees: 2, cars: 7, akitas: 8
+Sue 476: vizslas: 3, perfumes: 5, goldfish: 1
+Sue 477: cats: 7, cars: 4, trees: 1
+Sue 478: vizslas: 8, akitas: 3, goldfish: 0
+Sue 479: cars: 6, cats: 3, perfumes: 2
+Sue 480: goldfish: 1, children: 9, vizslas: 3
+Sue 481: pomeranians: 5, vizslas: 1, cars: 10
+Sue 482: children: 5, perfumes: 5, cats: 1
+Sue 483: perfumes: 2, goldfish: 7, trees: 6
+Sue 484: akitas: 2, goldfish: 4, perfumes: 10
+Sue 485: samoyeds: 3, goldfish: 0, akitas: 1
+Sue 486: trees: 8, vizslas: 9, goldfish: 0
+Sue 487: goldfish: 8, samoyeds: 0, trees: 0
+Sue 488: perfumes: 7, cars: 5, trees: 0
+Sue 489: vizslas: 3, pomeranians: 2, perfumes: 5
+Sue 490: cars: 5, perfumes: 5, akitas: 5
+Sue 491: children: 8, trees: 1, pomeranians: 4
+Sue 492: pomeranians: 0, akitas: 1, vizslas: 8
+Sue 493: akitas: 10, perfumes: 10, samoyeds: 8
+Sue 494: perfumes: 6, vizslas: 4, cats: 6
+Sue 495: children: 6, pomeranians: 5, samoyeds: 4
+Sue 496: vizslas: 1, trees: 5, akitas: 1
+Sue 497: vizslas: 10, perfumes: 10, pomeranians: 3
+Sue 498: samoyeds: 3, trees: 2, cars: 5
+Sue 499: cats: 6, children: 3, perfumes: 0
+Sue 500: pomeranians: 10, cats: 3, vizslas: 5
--- a/2015/day-16/solution.py
+++ b/2015/day-16/solution.py
@@ -0,0 +1,46 @@
+from __future__ import print_function
+import re
+import fileinput
+
+correctAunt = {
+        "children": 3,
+        "cats": 7,
+        "samoyeds": 2,
+        "pomeranians": 3,
+        "akitas": 0,
+        "vizslas": 0,
+        "goldfish": 5,
+        "trees": 3,
+        "cars": 2,
+        "perfumes": 1
+        }
+
+def isOK(auntString):
+    for thing, value in re.findall(r"([a-z]+): (\d+)", line):
+        if correctAunt[thing] != int(value):
+            return False
+
+    return True
+
+def isOK2(auntString):
+    for thing, value in re.findall(r"([a-z]+): (\d+)", line):
+        if thing == "cats" or thing == "trees":
+            if int(value) <= correctAunt[thing]:
+                return False
+
+        elif thing == "pomeranians" or thing == "goldfish":
+            if int(value) >= correctAunt[thing]:
+                return False
+
+        elif correctAunt[thing] != int(value):
+            return False
+
+    return True
+
+
+for line in fileinput.input():
+    if isOK(line):
+        print("Found aunt first:", line)
+
+    if isOK2(line):
+        print("Found aunt second:", line)
--- a/2015/day-17/README.md
+++ b/2015/day-17/README.md
@@ -0,0 +1,26 @@
+# Day 17 efficient solution
+
+Day 17 is an instance of the subset sum problem. This problem asks whether for
+a (multi)set of integers *V*, there is a non-empty subset of integers summing up to
+exactly *s*. This problem is NP-complete.
+
+The brute force approach of this is trying every possible set in the powerset
+of *V* to see if they match. This is inpractical however, because a powerset of
+a set of size *n* contains 2<sup>2</sup> sets.
+
+In the exercise, we have 20 buckets, and 2<sup>20</sup> is still
+brute-forcable. There is a smarter approach.
+
+We split the list of buckets in two lists of (approximately) the same size. We
+then take the powersets of those two lists and compute the sum for each entry.
+This leaves us with a total of 2<sup>n / 2 + 1</sup> entries. We then sort both
+sublists on the total value of each entry.
+
+Finally, we iterate of the first list, and use binary search to see whether
+there is an appropriately sized entry in the second list. This gives us a final
+complexity of *n* times 2<sup>*n*/2</sup>, allowing the solution to be computed
+instantly.
+
+The algorithm above can be modified to find all combinations, not just one, in
+time proportional to the number of solutions. This is implemented in the final
+program.
--- a/2015/day-17/input.txt
+++ b/2015/day-17/input.txt
@@ -0,0 +1,20 @@
+33
+14
+18
+20
+45
+35
+16
+35
+1
+13
+18
+13
+50
+44
+48
+6
+24
+41
+30
+42
--- a/2015/day-17/solution.py
+++ b/2015/day-17/solution.py
@@ -0,0 +1,62 @@
+from __future__ import print_function, division
+import fileinput
+from collections import defaultdict
+import bisect
+
+def value(buckets, choice):
+    total = 0
+    for value in buckets:
+        if choice % 2 == 1:
+            total += value
+
+        choice //= 2
+
+    return total
+
+def ones(x):
+    n = 0
+    while x > 0:
+        if x % 2:
+            n += 1
+
+        x //= 2
+
+    return n
+
+def partition(a_list):
+    pivot = len(a_list) // 2
+
+    return a_list[:pivot], a_list[pivot:]
+
+def partitionList(buckets):
+    result = [(value(buckets, x), ones(x)) for x in range(1 << len(buckets))]
+    result.sort()
+    return result
+
+buckets = []
+
+for line in fileinput.input():
+    buckets.append(int(line))
+
+partition1, partition2 = partition(buckets)
+
+values1 = partitionList(partition1)
+values2 = partitionList(partition2)
+
+possible = defaultdict(lambda: 0)
+
+i = 0
+
+target = 150
+
+for entry in values1:
+
+    i = bisect.bisect_left(values2, (target - entry[0], 0))
+
+    while i < len(values2) and entry[0] + values2[i][0] == target:
+        possible[entry[1] + values2[i][1]] += 1
+        i += 1
+
+print("Total possibilities:", sum(possible.values()))
+print("Minimal possibilities:", possible[min(possible.keys())])
+
--- a/2015/day-18/input.txt
+++ b/2015/day-18/input.txt
@@ -0,0 +1,100 @@
+#...##......#......##.##..#...##......##.#.#.###.#.#..#..#......####..#......###.#.#....#..##..###..
+####..#.#...#....#.#####.##.##.#..#.......#....#.##...###.###..#.#.#........#..#.#.##...##..#.####.#
+...#..##...#.#.###.#.###..#.##.####.###...#...........#.###..##.#.##.#.###...#.#..###....#.###.#..#.
+.#...##...####.#..#.....#..#...#.#.##...#...##..#.#.###....#..###.....##..#.###..###.....##..###...#
+..##.#####....##..#.#..##.##..######...#..###.######.....#..##...#.#..##..##..#..#..#..##.#.#.#.#...
+.###.###.###...##...##..###..##.###.#.....##..##.#.#########...##..##.#..##.#..##..####..#.#.#.#####
+#.#####..###.###.##.##.#...#.#.#.#..#.###...#..##.###.#...####.#..#.#.....###..#..####..#.#.#...##..
+....#...##.....#....####.##.#.###..#.#.##..#.#...##.###.###..#.##..#.#.##..##..#.##.###..#.#.###.###
+##.##...#.##...#.#..#.#..#...###...###.#..#..#.#####..###.#......#.....###.#####.#.#..#.#.#.##..#.#.
+#.#..#.....#.....##.#..##...###..##...##...###.#.###.#..#.#.###...##..##..#.###...#.#######.#...#.#.
+#.#.....####.#..#.##...#.##....#####.###.#.....#####....###..#........##..####...#...#.###....#..###
+##.#.##..#.#.##.#.....##.#.....###.####.#..######.....####.#.#..##.#.##...#..#.#.....#.####.#.......
+#..#..#.#..#.######.##..##.####.....##.#.##.#.######..#.#....#.#...#.#..#..#.#.###.#..#.#.#..#...###
+####..####.#.#.###.....#.#.#.##..#.##.##.##.#..##..##.#.##.....#.#..#.####.....###.#..#.####.#.#..##
+###.##..##.#.##..#..##...#.#####.##.#....##.####.#.##....#..###.#.#.##...#.....#.#.#.#.#..##.#.#..#.
+......#..####...##.##...#.##.##...##..#..##.###..#...#..##...#.#....###.####...#.##.###.#.##.####.##
+..#...#####.#.#..#.##....#..#...#..####.....###...##.###....#..#.###...#........#.#.##..#..#.#.....#
+#######.#.#.###.###..######.##..#####.##.###.###....####.#..##.##...###.#..############.#.##....##.#
+#.#...##.###.#.###..#.#.#.#.#.#..##..####.#..##.....#.##..#.##...##.#..##..#.#.#....##....##.#..#.#.
+..#.#.####.....###..#######.#.#.#.#...##.#####.....##...##...##.###..######.###..#...####.#..###.###
+.#.##....#.#.##..##.#.##.##..######...#.....#..#.#.#.#.....#.#..##.#.#.......#######....#.......#...
+..###.##.##..##....#.###...#.....##..##......###...##..###.##...##.###.#.#.#.###.###.#.#...###..#...
+.##.#.#...#...##.#.#...#..#..#.#...##.#.##...##..#....#.#..##.#..#.#..#.#.....#..#.#...#######.#.##.
+...####....#.###.#..###..##...##..#.#.#.###...#..##.##.##..##.#...#..#.##.....#.#........#..#.#.####
+.....##..###...#....#.#.#.#...###.###...#.#...#.#.####....#..####...###..#..######..##.##..###.#####
+#####.##..#....###.###....##.....#.#..#....#.#####.##.#.####.#.##...#..###...###..##...#.###.#####..
+###.##..........########.######....####.###.#..##...#.##.####.#.....##..#####..###...#####.....#.#.#
+##..#####.##.#.#####.#.##.##..#.##....########.#####.#...#.###.##...#.###.#.#..#....##.#..#...#.#.#.
+.##.#....#..#...#..#####..#..##.#......#..#....########...#..#...#.....####.#...##...#.###.#.#..##.#
+.##.##.#.##.#.##...#.#.#..##.##.###.#..##..#...###.##.###.#####.#.###..#..###.#...#.###.#...#..#.#.#
+.#..#..#.#..#..###..#....###.####.##.#.###.#.##.###.#.##.###.###...###...###.#...####...#.##.##.#.#.
+###..##...###...#..##.#..#.#...##....###.##.##..#####....###..#..#....#..###.###.#...#.##...#.#.#..#
+#....#.......##.....#.##...#..#.###.#.##..##..#.##..#.###..##.##...#####.#..#####..#####..#####....#
+.####.####....###..###.#.##.####.##.#...####.#.###.#.....#...####..#####.###..#.#.###.##.##...##..#.
+####..##...##.########...##..###..#..###.##.#.#.#........#.#####.#...#.###.####.#..####..#.#.#....##
+###.#..#...###.#..#..#.###...##..###.##.#.#...#..#...####..##....#.#..#..##.#.#...#####.###.#..#.#.#
+...##....#.###.#.#..##...##.###.#..#..#......#...#.#..####.#.##..######.####.#...#..#..#..##.#.#.##.
+##.####.#...#..#.#.##..##.#.#.###..##...####......#..######.#......#.##.#....##...###.#.#..#......##
+#.....#...#######.##.#..#.#...###.#..#.####....#.#.##.#.##...###..#...#.###.##..#.###..#.##...#####.
+#####.##...#..#.#.#.......#.##..#####..#####...###..##.#.#..###.#.#####.####..#.#..##...#.##...#.###
+.##.#..#######.###.#.####.....##...#.##.#.#..#...##....####......######.#..######.....##########.##.
+##...#.#..#.##.###.#.#.#.##.###.##..##.##.##...#.#..###.#######..#.....#####..#....######.#..##..###
+.#.#.###.....#..##..#.#..##..#.###...###.#..##...#...#.#####.#.#####..###.#..#...##..#.#..#..####...
+.#......##..#.....####.###....##.###.....###.##........#.###.##..#..#.#######.#.######..##..###.....
+..##.#.#..#.##...#.###.###...######..#..#.#..#....###.#.#....#..........#...##.##.##.#..##..#.#####.
+###.###.#..#.##..##.#..#..##.....##.....#..#######.#..#.#.#.####.###..###.#.#..#.##.##.####.###.####
+#.#.#..#....########.#..#..#...##..#.##..#.#..##..####...##.....#.##.#.#...########..#.###.#..#.#.##
+.##.....#...#.#...##.##....###...##..#.####...#..#.#..#..#.##..#.###.##.####.##..####.....##.#.....#
+....####.#.##.#.##.#..##.#.######.##.####..#...####.#..###.#.#..#..##.#.#.....##.#####.#.####...#.#.
+#..#####.#####.....##....######..##....#..#.#.###.#####.....##.##.####.#...##...#.##.#.#####.##.#...
+##.####..###.#....#...#.#.#.#.###.#####.#.####..####...####......##..#..#..#.#.##...########....#...
+.###.#.#.#.#..####.##.#..######..#.#.###.....#.#......#.#.#.#..####.##...##.#####.#.##..##..#..#.#..
+.....###...#...#.####.###.#.#.#.#.....#....#.####.###.##.##.##.#######......#.####......#....##.....
+##..#..#.#.##..#...#..##.##.##..###.#....##.##....####.#.##.###....#.##.#.#.##...##.###...#..#..####
+...#.#..##..##.#...##.##...#.#......#.#.##..###....####.##...#.#.###.#..#..#.####..##..##..#####.###
+.##.##..##########.##...#.##.####.#.#######.##.#.##.##..#...##....########.###..##.##.##.#..##.#.#.#
+#####.#....#.##..#.....#......##.##..#.##.###..##.......###..##.#.###.##.###....####.#..#.###..#.#.#
+.#...#..#.##....##....#...####....#...#..#...####...########.###.#..##.#.#.##..###..#.#.###.....##.#
+##..##.....###......#..###.##.####.##.####.#.#....#..#...#..#.#..#.###.#...#...#..##.##...#..#######
+.....##..###..##...#####.#.#.....###.#.#..####...#.#.#..#..####..##.#..###.####.#....##..###....#..#
+#.#.##.#....#.#####.#....##...#...##...##....#.#.......#....#..#...###.###.#.####..####....#.##.#.#.
+..##...##..###.#.#.##.#..#....#.#.....##.###.#.###.###.....#...#.#..#######.#####..#.###...##......#
+#......###..#....#.#..#.###.##.#...##..###.####.#.#....#.##..#.###..##.#..#####..##.###.....#..###..
+##.#.##..##.###.#..##.....#.##.....###....##.####.######.#...#..###....#.#...#.##.....###....#..#.#.
+.##.#.#.#.##..#.#.#..##..#.###.####....#..###.######..####.#.....###.##..#...###.#..######.##.#.##..
+...##.####.#..##.#####.##.#...##..#..#...#.#.#.#####...#....#..###...#..#....#.#.##.#.######.#..####
+..#.#.#.#...#.######.#.....#..#.#..###....#.#.########...#....#.#.##..#...##...#.#..#.#.###....##...
+#####..#..##..#..##..#..#.#.##.#....#####.####.##.#.###..##..##....#.....#.#####.#...#.#####.##.#.#.
+#.#..#####...####.###.###.....####.###.....##...##...#..#..#######.#.##....##..####.....##...#..#..#
+#.#.###.#.#..##..#....#.#...#.#.##.##..#.##.....##...#.#..##.......##.#.###..#####.#.##....#.##.....
+...#.......#....#.#.####.#.###.###..#....#..##.#..####........#.##..#...#.#...###.#..#.#.#...#...#..
+...##.#####.##.#.###.##.##.#.##..##.#.#.#.#.#.##.#..##...##.#.#..#..##.##.#####.#.###...#####..#..#.
+#######.#..#..#....##.#.#..####.#..#..###...#..#.......###.#.#.####....#.###...#.#.###.#.#.#.#..###.
+..##.##.#.##.###....###.##.#.###.#...#....#.####..###..###.#.#..#...##.#.#.#..##.###..###.#.##...###
+######..######..##..##.#.#.##.##.#..##..#.#.#.##..#.#...#...#.#.#..######.#..#.#.######..#......##.#
+#.#####.....#.......#########..###.##...#...##.#.#..#...#####...#...#..#.###.#..#.#...###.#.#.#...#.
+#....##....###...##.##.#...##.........##.#.#..#.#.##.#.######.#####..#..###.###.#...#.#.##.######...
+#.#...###.#.###.##.#.######.#######.###.##..#.#.#...######.##.####.##..#.#.#.#......##..##.........#
+..###..##....#.....##...#.#.###.#.#.....##.#...###.####.#...#...##..##.#.#.####..###...######....#.#
+..###.#.##.####.#..#.##....##..#####....#..##.##.#..#######...#.####...##.#.#.##.........#....#....#
+.##.#...#.####..#.#...#.##..######.##..##.#.###.##..###.###....##..#.##.##..##.#...###.##.##.###....
+#...###.###.#..#....#.......#..#.....###..#.###.##.##....#.####.#.####.##..##..#..#.....#....##.#.#.
+.##.#..#..#.##.......#.####.#######.....#.##.##.#.....#.#..#....######.#..###.##.##.....#.####..##.#
+###..#.###.#..####.....##....#..####....#.##.##..#...######.#########...#.#....##...###.#..#.##...#.
+#..###..##..#.#.##.###.#.#.##...###.#...##.##..#.###....###..#.#...#.###..######.#..#.###..#..#..#.#
+.#........##.#.###..###.#.#.##.....##.##.#.#...##..#.##....###..#.#.#.#.##....#.##..#.#...###...#...
+####.####..#....#.#.#..#..##.......##.####...###.##..#.#.##.#..##..######.......##.#.##..#...#.....#
+..#..#..###..##.##..######.#..###..###.#.##..##.#..#####.#.#.#.##..#.##..##.##......####.#..........
+...##.##..###.#...###....#.#.#.#.....#.##.....##...#...#......####...##.##....##.#..#.####.#..###.#.
+..#.....####.#.###.#####..#..###..#..#.#...#####...###.###....#.###..#...#..#..#.#..#.##..##.#.#....
+..##.#####...###.###.........#....##.####.##..#.#..#.#...#...##.##.##..#.#.##.########......#####...
+...###.#.#..#...#.###.###.......##.###.#..#.##########...#..#.#.#.##.#.###...######..#.#...###.##...
+.#.#.#######.#..##.##..##...#...####...#..#####.#..##...###.#.#...#.##...#......#..##.####..#.....##
+.##.##.#.#......#######..###.....##.#.##..###......#....####...#.###.#.##.#........#..#....##.....##
+#...#.###.#.##...##.####....#...#.###..#.#.....#.#....#.#.#.##...#.#..#####.#.#..#..#..#....#...####
+.....##...###......#####..##.##.##...##.#.#####..##...#.#.#.#.###...###.##.####..#.#..#.#..#.####.##
+#..#..##.#.##.#.##.#.#.#..###....###.##.#.##.#...#.#..#...#....###.#..#.#.######.#...####..#..##.#.#
+#..#.#..#...###.#..##.#...#...##.#......#...#..#..####..##.....#.###...#.#..#.#....#.#####.##.###...
+###....#.#..#.#..###..#.##......#...#..#..##.#..###..##..#..#.####..#...########..##.#.##.#.#.#...#.
+.#.#.##.##.###..#...#.#....#..#.##..#.#.#.#.##.##.#####...#........####..###..####.#####..#.##.#.##.
--- a/2015/day-18/sample.txt
+++ b/2015/day-18/sample.txt
@@ -0,0 +1,6 @@
+.#.#.#
+...##.
+#....#
+..#...
+#.#..#
+####..
--- a/2015/day-18/solution.py
+++ b/2015/day-18/solution.py
@@ -0,0 +1,54 @@
+from __future__ import print_function
+import fileinput
+
+
+def neighbours(x, y, field):
+    alive = 0
+    for i in range(max(x - 1, 0), min(x + 2, len(field))):
+        for j in range(max(y - 1, 0), min(y + 2, len(field))):
+            if i == x and j == y:
+                continue
+
+            if field[i][j]:
+                alive += 1
+
+    return alive
+
+def newState(x, y, field):
+    alive = neighbours(x, y, field)
+    if field[x][y]:
+        return alive == 2 or alive == 3
+
+    return alive == 3
+
+def update(field):
+    newField = []
+    for x in range(len(field)):
+        newField.append([newState(x, y, field) for y in range(len(field))])
+
+    return newField
+
+def enableCorners(field):
+    size = len(field) - 1
+    field[0][0] = field[0][size] = field[size][0] = field[size][size] = True
+
+
+field = []
+for line in fileinput.input():
+    field.append([c == '#' for c in line.strip()])
+
+original = field
+
+for i_ in range(100):
+    field = update(field)
+
+print ("Without corners:", sum([sum(int(y) for y in x) for x in field]))
+
+field = original
+enableCorners(field)
+
+for i_ in range(100):
+    field = update(field)
+    enableCorners(field)
+
+print ("With corners:", sum([sum(int(y) for y in x) for x in field]))
--- a/2015/day-19/input.txt
+++ b/2015/day-19/input.txt
@@ -0,0 +1,45 @@
+Al => ThF
+Al => ThRnFAr
+B => BCa
+B => TiB
+B => TiRnFAr
+Ca => CaCa
+Ca => PB
+Ca => PRnFAr
+Ca => SiRnFYFAr
+Ca => SiRnMgAr
+Ca => SiTh
+F => CaF
+F => PMg
+F => SiAl
+H => CRnAlAr
+H => CRnFYFYFAr
+H => CRnFYMgAr
+H => CRnMgYFAr
+H => HCa
+H => NRnFYFAr
+H => NRnMgAr
+H => NTh
+H => OB
+H => ORnFAr
+Mg => BF
+Mg => TiMg
+N => CRnFAr
+N => HSi
+O => CRnFYFAr
+O => CRnMgAr
+O => HP
+O => NRnFAr
+O => OTi
+P => CaP
+P => PTi
+P => SiRnFAr
+Si => CaSi
+Th => ThCa
+Ti => BP
+Ti => TiTi
+e => HF
+e => NAl
+e => OMg
+
+CRnSiRnCaPTiMgYCaPTiRnFArSiThFArCaSiThSiThPBCaCaSiRnSiRnTiTiMgArPBCaPMgYPTiRnFArFArCaSiRnBPMgArPRnCaPTiRnFArCaSiThCaCaFArPBCaCaPTiTiRnFArCaSiRnSiAlYSiThRnFArArCaSiRnBFArCaCaSiRnSiThCaCaCaFYCaPTiBCaSiThCaSiThPMgArSiRnCaPBFYCaCaFArCaCaCaCaSiThCaSiRnPRnFArPBSiThPRnFArSiRnMgArCaFYFArCaSiRnSiAlArTiTiTiTiTiTiTiRnPMgArPTiTiTiBSiRnSiAlArTiTiRnPMgArCaFYBPBPTiRnSiRnMgArSiThCaFArCaSiThFArPRnFArCaSiRnTiBSiThSiRnSiAlYCaFArPRnFArSiThCaFArCaCaSiThCaCaCaSiRnPRnCaFArFYPMgArCaPBCaPBSiRnFYPBCaFArCaSiAl
--- a/2015/day-19/solution.py
+++ b/2015/day-19/solution.py
@@ -0,0 +1,57 @@
+from __future__ import print_function
+import fileinput
+import re
+
+def doReplace(replacement, medicine):
+    replacements = []
+    for match in re.finditer(replacement[0], medicine):
+        pos = match.start()
+        sub = medicine[:pos] + replacement[1] + medicine[pos + len(replacement[0]):]
+        replacements.append(sub)
+
+    return replacements
+
+def allReplacements(replacements, medicine):
+    options = set()
+    # Simply attempt all replacements
+    for replacement in replacements:
+        for option in doReplace(replacement, medicine):
+            options.add(option)
+
+    return options
+
+
+# Exhaustive search trying to work back from the medicine.
+#
+# This is minimal because we try the larger substitutions first.
+def solve(replacements, target, current):
+    if current == target:
+        return 0
+
+    for org, rep in replacements:
+        for option in doReplace((rep, org), current):
+            result = solve(replacements, target, option)
+            if result is not None:
+                return result + 1
+
+    return None
+
+replacements = []
+medicine = None
+
+for line in fileinput.input():
+    if len(line.strip()) == 0:
+        continue
+
+    match = re.match(r"(\w+) => (\w+)", line)
+    if match:
+        replacements.append(match.group(1, 2))
+    else:
+        medicine = line.strip()
+
+replacements.sort(key=lambda x: -len(x[1]))
+
+
+print("Options:", len(allReplacements(replacements, medicine)))
+
+print("Steps:", solve(replacements, 'e', medicine))
--- a/2015/day-20/solution.py
+++ b/2015/day-20/solution.py
@@ -0,0 +1,23 @@
+from __future__ import print_function
+
+def findFirst(data, target):
+    return next(idx for idx, value in enumerate(data) if value >= target)
+
+target = 34000000
+
+# Target is achieved at itself/10, so reasonable upper bound.
+upperbound = target // 10
+
+# Use a varation of Erathostenes' sieve to compute the results
+sieve1 = [10] * (upperbound + 1)
+sieve2 = [10] * (upperbound + 1)
+
+for x in range(1, upperbound):
+    for y in range(x, upperbound, x):
+        sieve1[y] += 10 * x
+
+    for y in range(x, min(50 * x, upperbound) + 1, x):
+        sieve2[y] += 11 * x
+
+print("House", findFirst(sieve1, target))
+print("House", findFirst(sieve2, target))
--- a/2015/day-21/solution.py
+++ b/2015/day-21/solution.py
@@ -0,0 +1,50 @@
+from __future__ import print_function, division
+from itertools import product, combinations
+import math
+
+def price(c):
+    return c[0][0] + c[1][0] + c[2][0][0] + c[2][1][0]
+
+def power(c):
+    return c[0][1] + c[1][1] + c[2][0][1] + c[2][1][1]
+
+def armor(c):
+    return c[0][2] + c[1][2] + c[2][0][2] + c[2][1][2]
+
+def wins(c, monsterHP, monsterAttack, monsterArmor):
+    monsterDamage = max(1, monsterAttack - armor(c))
+    heroDamage = max(1, power(c) - monsterArmor)
+
+    return math.ceil(100 / monsterDamage) >= math.ceil(monsterHP / heroDamage)
+
+weapons = [
+        (8, 4, 0),
+        (10, 5, 0),
+        (25, 6, 0),
+        (40, 7, 0),
+        (74, 8, 0)
+        ]
+
+armors = [
+        (0, 0, 0), # Dummy armor
+        (13, 0, 1),
+        (31, 0, 2),
+        (53, 0, 3),
+        (75, 0, 4),
+        (102, 0, 5)
+        ]
+
+rings = list(combinations([
+        (0, 0, 0), # Dummy ring
+        (0, 0, 0), # Second dummy ring
+        (25, 1, 0),
+        (50, 2, 0),
+        (100, 3, 0),
+        (20, 0, 1),
+        (40, 0, 2),
+        (80, 0, 3),
+        ], 2))
+
+
+print(min(price(c) for c in product(weapons, armors, rings) if wins(c, 103, 9, 2)))
+print(max(price(c) for c in product(weapons, armors, rings) if not wins(c, 103, 9, 2)))
--- a/2015/day-22/solution.py
+++ b/2015/day-22/solution.py
@@ -0,0 +1,106 @@
+from __future__ import print_function, division
+import heapq
+
+def applyEffects(current):
+    if current['recharge'] > 0:
+        current['mana'] += 101
+        current['recharge'] -= 1
+
+    if current['shield'] > 0:
+        current['shield'] -= 1
+
+    if current['poison'] > 0:
+        current['poison'] -= 1
+        current['bossHP'] -= 3
+
+
+def dijkstraMagic(initialState, hard):
+    todo = [(0, 0, initialState.copy())]
+
+    visited = {tuple(initialState.values()): 0}
+    iteration = 0
+
+    while todo:
+        iteration += 1
+        top = heapq.heappop(todo)
+        current = top[2].copy()
+        manaSpent = top[0]
+
+        if hard:
+            # Hard mode
+            current['hp'] -= 1
+
+        if current['hp'] <= 0:
+            # Already dead
+            continue
+
+        applyEffects(current)
+
+        if current['bossHP'] <= 0:
+            # We won!
+            return manaSpent
+
+        # Try every available spell
+        for spell in spells:
+            if current['mana'] < spell[1]:
+                # Not enough mana to cast
+                continue
+
+            if spell[4] is not None and current[spell[4]] > 0:
+                # Effect still active
+                continue
+
+            newState = current.copy()
+            newState['bossHP'] -= spell[2]
+            newState['mana'] -= spell[1]
+            newState['hp'] += spell[3]
+            if spell[4] is not None:
+                newState[spell[4]] = spell[5]
+
+            newMana = manaSpent + spell[1]
+
+            # Start Boss turn
+            applyEffects(newState)
+
+            if newState['bossHP'] > 0:
+                # Alive to attack?
+                if newState['shield'] > 0:
+                    damage = 2
+                else:
+                    damage = 9
+
+                newState['hp'] -= damage
+            else:
+                # Died during effects
+                return newMana
+
+            if newState['hp'] > 0:
+                # New state
+                key = tuple(newState.values())
+                if key not in visited or visited[key] > newMana:
+                    # Insert the route in to the visited and queue
+                    visited[key] = newMana
+                    heapq.heappush(todo, (newMana, iteration, newState))
+
+    return None
+
+spells = [
+        # Name, Mana, Damage, Heal, Effect, Turns
+        ("Magic Missile", 53, 4, 0, None, 0),
+        ("Drain", 73, 2, 2, None, 0),
+        ("Shield", 113, 0, 0, "shield", 6),
+        ("Poison", 173, 0, 0, "poison", 6),
+        ("Recharge", 229, 0, 0, "recharge", 5),
+        ]
+
+status = {
+        "bossHP": 51,
+        "hp": 50,
+        "mana": 500,
+        "shield": 0,
+        "poison": 0,
+        "recharge": 0
+        }
+
+print(dijkstraMagic(status, False))
+print(dijkstraMagic(status, True))
--- a/2015/day-23/input.txt
+++ b/2015/day-23/input.txt
@@ -0,0 +1,49 @@
+jio a, +19
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+jmp +23
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+jio a, +8
+inc b
+jie a, +4
+tpl a
+inc a
+jmp +2
+hlf a
+jmp -7
--- a/2015/day-23/solution.py
+++ b/2015/day-23/solution.py
@@ -0,0 +1,44 @@
+from __future__ import division, print_function
+import fileinput
+import re
+
+def run(instructions, registers):
+    instrptr = 0
+    while instrptr < len(instructions):
+        instruction = instructions[instrptr]
+        if "j" in instruction[0]:
+            if instruction[0] == "jie":
+                doJump = registers[instruction[1]] % 2 == 0
+            elif instruction[0] == "jio":
+                doJump = registers[instruction[1]] == 1
+            else:
+                doJump = True
+
+            if doJump:
+                instrptr = instrptr + int(instruction[-1])
+            else:
+                instrptr += 1
+
+            continue
+
+        if instruction[0] == "hlf":
+            registers[instruction[1]] //= 2
+        elif instruction[0] == "tpl":
+            registers[instruction[1]] *= 3
+        else:
+            registers[instruction[1]] += 1
+
+        instrptr += 1
+
+    return registers
+
+instructions = []
+
+for line in fileinput.input():
+    instructions.append(tuple(x.strip() for x in re.match(r"(hlf|tpl|inc|jmp|jie|jio) (a|b)?,? ?(\+?-?[0-9]+)?", line).groups() if x is not None))
+
+
+
+print(run(instructions, {'a': 0, 'b': 0})['b'])
+print(run(instructions, {'a': 1, 'b': 0})['b'])
+
--- a/2015/day-24/input.txt
+++ b/2015/day-24/input.txt
@@ -0,0 +1,28 @@
+1
+3
+5
+11
+13
+17
+19
+23
+29
+31
+41
+43
+47
+53
+59
+61
+67
+71
+73
+79
+83
+89
+97
+101
+103
+107
+109
+113
--- a/2015/day-24/solution.py
+++ b/2015/day-24/solution.py
@@ -0,0 +1,20 @@
+from __future__ import print_function, division
+import fileinput
+import itertools
+import functools
+import operator
+
+def qes(packageList):
+    return functools.reduce(operator.mul, packageList)
+
+def minQES(packages, slots):
+    targetWeight = sum(packages) // slots
+    for i in range(1, len(packages)):
+        solutions = [x for x in itertools.combinations(packages, i) if sum(x) == targetWeight]
+        if len(solutions) > 0:
+            return min(qes(x) for x in solutions)
+
+packages = set([int(x) for x in fileinput.input()])
+
+print(minQES(packages, 3))
+print(minQES(packages, 4))
--- a/2015/day-25/solution.py
+++ b/2015/day-25/solution.py
@@ -0,0 +1,18 @@
+from __future__ import print_function
+
+def findCode(n):
+    modBase = 33554393
+    base = 252533
+    start = 20151125
+
+    code = start * pow(base, n - 1, modBase)
+    return code % modBase
+
+row = 2947
+col = 3029
+
+triangleNo = row + col - 1
+subTriangleSurface = ((triangleNo - 1) * triangleNo) // 2
+n = subTriangleSurface + col
+
+print(findCode(n))
--- a/2015/runall.sh
+++ b/2015/runall.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+rundir()
+{
+	input=""
+	if [ -f $1/input.txt ]; then
+		input="$1/input.txt"
+	fi
+
+	for i in $1/*.py; do
+		echo "$i" "$input"
+		time python "$i" "$input"
+		echo
+	done
+}
+
+for i in day-*; do
+	rundir $i
+done