diff --git a/2018/inputs/17.txt b/2018/inputs/17.txt
new file mode 100644
index 0000000..c29b948
--- /dev/null
+++ b/2018/inputs/17.txt
@@ -0,0 +1,1884 @@
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+x=613, y=418..420
+x=516, y=641..650
+x=524, y=1456..1476
+y=788, x=555..569
+x=630, y=1644..1666
+y=1308, x=583..592
+y=25, x=606..608
+x=537, y=1134..1146
+y=1352, x=381..389
+x=508, y=1194..1204
+y=166, x=477..480
+x=416, y=1156..1172
+y=1511, x=468..470
+x=378, y=1040..1046
+x=556, y=1074..1086
+x=425, y=1165..1167
+x=609, y=418..420
+y=669, x=589..592
+y=1397, x=585..587
+x=587, y=685..687
+x=385, y=481..505
+x=501, y=1174..1185
+x=360, y=1041..1046
+x=603, y=1544..1561
+x=560, y=1284..1294
+x=336, y=1251..1256
+x=505, y=791..798
+x=381, y=1527..1543
+x=502, y=736..745
+y=466, x=373..396
+x=510, y=1194..1204
+x=341, y=793..815
+y=1495, x=334..339
+x=357, y=1368..1377
+x=540, y=406..420
+x=538, y=530..542
+x=490, y=317..328
+x=300, y=714..741
+x=628, y=1676..1687
+y=867, x=527..552
+y=1182, x=422..426
+y=1426, x=480..502
+x=350, y=195..209
+x=428, y=1570..1597
+x=300, y=156..181
+x=425, y=1367..1368
+y=1526, x=416..422
+x=303, y=694..715
+x=324, y=214..238
+x=468, y=1011..1021
+x=397, y=550..567
+x=518, y=731..755
+x=371, y=1389..1412
+x=625, y=719..734
+y=146, x=448..549
+x=586, y=626..637
+x=589, y=1698..1710
+y=123, x=462..541
+x=539, y=1036..1039
+x=624, y=478..492
+x=614, y=1342..1356
+y=1645, x=387..394
+x=618, y=15..32
+x=513, y=1496..1500
+x=321, y=1196..1208
+y=162, x=583..602
+x=474, y=821..832
+x=605, y=1022..1025
+x=416, y=1683..1686
+x=532, y=552..565
+x=333, y=1547..1560
+x=474, y=252..257
+y=1576, x=345..361
+x=614, y=1100..1120
+x=442, y=1627..1645
+y=532, x=389..414
+x=396, y=671..689
+y=425, x=603..621
+x=469, y=1373..1397
+x=349, y=49..71
+y=1686, x=416..420
+x=456, y=57..60
+x=461, y=803..815
+x=598, y=1413..1427
+x=353, y=1430..1435
+x=455, y=1589..1596
+y=181, x=300..312
+x=295, y=1611..1625
+y=650, x=466..516
+y=251, x=612..622
+x=373, y=286..306
+x=602, y=657..675
+x=449, y=685..694
+y=1720, x=551..577
+x=486, y=760..772
+x=633, y=1364..1385
+x=360, y=1156..1165
+y=372, x=577..598
+y=1165, x=342..360
+y=71, x=620..625
+x=310, y=1348..1351
+x=457, y=867..881
+y=695, x=378..381
+y=1435, x=353..355
+x=534, y=1507..1533
+x=591, y=947..954
+x=549, y=1017..1044
+x=346, y=1132..1143
+x=409, y=222..226
+x=530, y=1017..1044
+y=1021, x=347..361
+x=524, y=505..518
+x=550, y=481..493
+x=550, y=834..841
+y=850, x=557..566
+y=1285, x=351..353
+x=395, y=988..1000
+x=555, y=381..393
+y=1101, x=376..422
+y=1507, x=556..560
+x=342, y=1155..1165
+x=530, y=1529..1533
+x=487, y=991..1002
+y=1467, x=458..461
+x=478, y=449..460
+x=598, y=505..519
+x=350, y=1328..1338
+y=339, x=340..348
+x=330, y=1158..1162
+x=369, y=1571..1585
+x=565, y=813..823
+x=516, y=1550..1560
+x=454, y=325..330
+x=584, y=1238..1240
+y=394, x=602..629
+x=343, y=1463..1474
+y=23, x=499..515
+x=575, y=1104..1107
+y=1104, x=502..522
+x=548, y=67..68
+y=560, x=523..525
+y=530, x=358..379
+x=376, y=1098..1101
+x=581, y=1073..1099
+x=630, y=338..353
+x=354, y=949..975
+x=348, y=315..339
+x=525, y=731..755
+y=1596, x=443..455
+y=1332, x=494..508
+y=734, x=620..625
+x=499, y=1197..1210
+y=1730, x=359..379
+x=462, y=110..123
+x=604, y=119..142
+x=395, y=522..525
+y=974, x=431..449
+x=371, y=524..526
+x=486, y=704..706
+y=1345, x=315..334
+x=571, y=1103..1107
+x=502, y=177..184
+x=421, y=810..816
+y=1496, x=596..617
+x=331, y=470..481
+x=624, y=1391..1407
+x=494, y=888..899
+x=614, y=626..645
+y=1192, x=561..568
+x=411, y=988..1000
+y=1393, x=561..566
+x=388, y=131..136
+x=451, y=632..653
+x=361, y=1697..1709
+x=584, y=853..869
+x=359, y=1716..1730
+x=527, y=865..867
+y=993, x=302..312
+y=1414, x=346..348
+y=20, x=560..562
+y=839, x=584..603
+y=349, x=509..512
+y=207, x=552..554
+y=1699, x=329..357
+x=430, y=108..134
+y=1727, x=527..541
+x=510, y=1379..1393
+x=471, y=73..82
+x=528, y=176..193
+y=351, x=570..573
+y=902, x=576..596
+y=728, x=549..568
+x=485, y=1374..1398
+x=576, y=1411..1431
+y=295, x=425..431
+y=687, x=584..587
+y=823, x=565..586
+x=410, y=1315..1324
+x=466, y=57..65
+x=358, y=312..329
+x=557, y=180..189
+y=1500, x=496..513
+y=544, x=301..306
+x=371, y=1493..1495
+x=594, y=483..496
+x=486, y=645..647
+x=502, y=1421..1426
+x=477, y=205..215
+x=577, y=1702..1720
+y=1264, x=570..581
+y=1495, x=367..371
+x=452, y=947..956
+y=637, x=580..586
+x=592, y=1364..1368
+x=560, y=1480..1507
+x=542, y=484..489
+y=523, x=569..578
+x=348, y=1348..1361
+x=312, y=157..181
+x=490, y=1488..1493
+x=549, y=1255..1273
+x=568, y=722..728
+x=619, y=262..266
+x=508, y=1332..1335
+y=647, x=486..505
+y=385, x=455..458
+x=528, y=1439..1442
+x=510, y=1179..1182
+x=568, y=11..24
+y=1652, x=552..561
+x=502, y=1090..1104
+y=1553, x=609..611
+y=1696, x=347..349
+x=493, y=1568..1577
+x=311, y=765..787
+x=581, y=345..355
+x=474, y=1656..1673
+x=483, y=1408..1412
+y=831, x=486..488
+y=819, x=429..449
+y=505, x=385..387
+y=1132, x=561..583
+y=98, x=460..463
+x=329, y=59..78
+x=381, y=1676..1687
+y=918, x=429..450
+y=368, x=557..560
+y=1646, x=342..363
+y=1707, x=496..515
+x=601, y=481..493
+y=1691, x=347..349
+y=645, x=486..505
+x=419, y=142..158
+x=400, y=24..34
+x=608, y=1109..1115
+x=570, y=913..916
+x=419, y=399..419
+x=559, y=1523..1548
+x=597, y=277..290
+x=480, y=823..836
+x=622, y=190..194
+x=560, y=18..20
+x=526, y=1439..1442
+x=618, y=1651..1661
+x=392, y=831..834
+x=479, y=58..65
+x=527, y=1708..1727
+x=473, y=1008..1018
+x=517, y=473..492
+x=306, y=517..544
+x=578, y=87..99
+x=608, y=25..29
+x=389, y=1657..1667
+x=586, y=219..229
+x=621, y=1391..1407
+x=449, y=972..974
+y=1324, x=410..431
+y=1556, x=609..611
+x=364, y=394..398
+y=1044, x=530..549
+x=342, y=1194..1202
+x=349, y=1153..1161
+x=371, y=713..733
+x=371, y=138..150
+x=479, y=1499..1518
+y=1621, x=331..342
+x=552, y=204..207
+x=430, y=1402..1406
+y=1393, x=498..510
+x=468, y=1504..1511
+y=1243, x=575..591
+x=494, y=529..542
+y=856, x=481..485
+y=353, x=610..630
+x=390, y=157..160
+x=420, y=61..76
+x=494, y=35..37
+x=312, y=1133..1144
+x=369, y=1091..1104
+x=381, y=1488..1502
+x=315, y=821..824
+x=522, y=529..542
+x=511, y=739..748
+x=505, y=917..944
+x=608, y=1422..1424
+x=466, y=422..426
+x=357, y=1133..1143
+x=398, y=1659..1671
+x=620, y=1532..1536
+x=623, y=1301..1311
+x=539, y=1327..1338
+x=578, y=276..290
+x=443, y=684..694
+x=535, y=1169..1180
+y=1162, x=327..330
+y=78, x=305..329
+y=1533, x=534..538
+x=477, y=163..166
+x=364, y=1714..1727
+y=729, x=464..491
+y=934, x=541..563
+y=1256, x=336..355
+x=572, y=1594..1614
+x=491, y=846..859
+x=341, y=1280..1301
+y=781, x=368..394
+y=1314, x=577..604
+x=466, y=640..650
+y=1709, x=361..378
+y=934, x=577..591
+y=916, x=570..587
+y=406, x=330..336
+y=334, x=566..586
+x=518, y=1637..1658
+y=164, x=384..411
+y=224, x=576..578
+x=467, y=569..590
+y=376, x=550..570
+y=1061, x=610..613
+x=475, y=739..748
+x=466, y=801..811
+x=591, y=994..1006
+y=675, x=576..602
+x=475, y=1260..1274
+x=550, y=363..376
+x=375, y=184..186
+y=1238, x=582..584
+y=1614, x=567..572
+y=384, x=483..490
+x=489, y=1655..1673
+x=523, y=1282..1286
+y=303, x=527..543
+x=332, y=1533..1544
+x=471, y=847..859
+x=384, y=550..567
+x=546, y=1132..1143
+x=580, y=601..612
+x=528, y=1304..1317
+y=841, x=526..550
+y=494, x=426..447
+y=1462, x=501..503
+y=136, x=388..392
+y=37, x=494..499
+y=881, x=457..484
+x=422, y=1098..1101
+x=365, y=173..191
+x=354, y=1639..1643
+y=450, x=559..562
+y=1502, x=358..381
+y=787, x=311..331
+y=1412, x=475..483
+x=338, y=1547..1560
+x=303, y=1617..1621
+y=1384, x=561..566
+x=459, y=206..215
+x=491, y=738..748
+x=418, y=1494..1501
+x=552, y=428..438
+x=506, y=7..20
+y=1368, x=533..552
+x=617, y=1470..1496
+x=445, y=1606..1618
+x=474, y=618..630
+x=378, y=316..324
+x=506, y=429..450
+x=600, y=1351..1371
+y=1525, x=429..456
+x=422, y=1456..1471
+x=541, y=462..473
+x=418, y=1551..1567
+y=692, x=378..381
+x=324, y=887..913
+y=1561, x=603..618
+x=436, y=1244..1255
+y=117, x=371..374
+y=1471, x=588..591
+y=1667, x=389..392
+y=484, x=537..542
+y=567, x=384..397
+x=316, y=69..73
+x=568, y=490..498
+x=493, y=1184..1199
+x=354, y=313..329
+y=832, x=360..373
+y=811, x=466..468
+x=380, y=1404..1409
+x=600, y=744..772
+y=1002, x=470..487
+y=1202, x=595..618
+x=562, y=1069..1090
+x=599, y=1016..1030
+x=622, y=348..350
+x=614, y=1677..1687
+x=370, y=1695..1705
+x=347, y=599..625
+x=605, y=1206..1215
+x=449, y=1207..1210
+x=316, y=951..967
+y=1514, x=444..447
+x=420, y=1603..1630
+x=408, y=552..573
+x=534, y=1422..1446
+x=402, y=553..573
+x=464, y=422..426
+x=576, y=216..224
+x=351, y=1285..1291
+y=312, x=498..509
+x=497, y=316..328
+x=327, y=982..989
+x=304, y=763..789
+y=789, x=301..304
+x=542, y=196..210
+x=349, y=1466..1477
+x=423, y=1395..1409
+x=329, y=1041..1064
+x=431, y=1627..1645
+y=31, x=375..389
+y=1442, x=526..528
+x=542, y=1283..1294
+x=520, y=872..890
+x=423, y=434..454
+y=826, x=434..453
+x=505, y=596..609
+x=416, y=1519..1526
+x=606, y=1699..1710
+x=424, y=1204..1228
+x=407, y=1534..1552
+x=631, y=440..452
+y=1560, x=364..373
+y=1627, x=494..499
+x=576, y=1381..1396
+y=1167, x=318..336
+x=320, y=464..467
+y=1456, x=577..590
+y=404, x=330..336
+x=344, y=194..209
+x=466, y=701..704
+x=593, y=1532..1557
+x=311, y=259..280
+y=872, x=352..356
+x=443, y=1590..1596
+x=518, y=1043..1058
+x=587, y=913..916
+y=459, x=301..325
+x=473, y=1542..1546
+x=574, y=108..130
+x=483, y=1620..1633
+y=784, x=536..546
+x=464, y=702..704
+y=772, x=600..610
+x=360, y=1134..1146
+y=226, x=409..413
+x=584, y=297..310
+y=1412, x=371..393
+y=140, x=295..319
+y=393, x=555..558
+y=1653, x=305..310
+x=633, y=1590..1599
+y=1493, x=602..605
+x=431, y=1315..1324
+x=557, y=1412..1431
+y=794, x=478..498
+y=1025, x=605..609
+y=1518, x=463..479
+x=516, y=51..65
+x=578, y=1638..1642
+y=1525, x=346..370
+x=481, y=854..856
+x=359, y=1066..1084
+y=1557, x=583..593
+x=472, y=418..433
+x=546, y=277..279
+x=305, y=1631..1653
+x=541, y=110..123
+x=573, y=921..929
+x=313, y=1266..1278
+x=449, y=334..354
+x=399, y=306..315
+x=441, y=1677..1694
+x=564, y=1256..1273
+x=557, y=842..850
+x=410, y=399..419
+y=1042, x=391..481
+y=1319, x=382..404
+x=564, y=158..170
+y=710, x=478..502
+y=1458, x=332..382
+x=378, y=1698..1709
+y=689, x=490..513
+x=613, y=1644..1666
+y=229, x=566..586
+y=1658, x=518..529
+x=522, y=1091..1104
+y=1377, x=353..357
+x=625, y=58..71
+x=350, y=911..937
+y=1320, x=515..520
+x=583, y=946..954
+y=653, x=451..463
+x=312, y=1461..1481
+x=544, y=732..734
+x=502, y=699..710
+x=594, y=579..582
+y=1274, x=475..542
+y=612, x=572..580
+x=491, y=975..997
+x=498, y=1634..1641
+x=387, y=1404..1409
+x=539, y=322..326
+x=521, y=1006..1025
+y=150, x=369..371
+y=1727, x=364..371
+y=279, x=533..546
+x=331, y=764..787
+x=568, y=1186..1192
+x=526, y=482..493
+x=393, y=421..428
+x=587, y=1397..1401
+y=438, x=527..552
+y=1212, x=388..394
+x=381, y=692..695
+x=441, y=56..60
+y=694, x=578..599
+y=1641, x=498..505
+y=1536, x=602..620
+y=1058, x=506..518
+x=624, y=190..194
+x=584, y=507..530
+x=608, y=1170..1178
+x=422, y=1178..1182
+x=564, y=384..396
+x=496, y=456..458
+x=382, y=1051..1063
+x=600, y=114..119
+y=582, x=579..594
+x=526, y=658..669
+x=361, y=1576..1579
+y=929, x=567..573
+x=431, y=1191..1217
+y=433, x=453..472
+x=556, y=89..92
+x=351, y=673..687
+x=338, y=50..71
+y=1076, x=431..435
+x=475, y=450..460
+y=799, x=574..594
+x=578, y=1491..1505
+x=555, y=760..788
+x=620, y=58..71
+x=358, y=510..530
+x=339, y=1483..1495
+x=537, y=1112..1126
+x=359, y=699..713
+y=68, x=548..552
+x=382, y=1640..1649
+x=567, y=920..929
+x=543, y=298..303
+x=379, y=184..186
+x=552, y=446..455
+x=609, y=1553..1556
+x=548, y=383..396
+x=369, y=689..701
+y=720, x=601..604
+x=322, y=1593..1604
+x=505, y=1692..1697
+x=346, y=1405..1414
+x=431, y=972..974
+y=1025, x=516..521
+x=591, y=925..934
+x=484, y=867..881
+y=721, x=518..520
+y=1356, x=614..618
+x=456, y=1503..1525
+y=524, x=332..335
+y=99, x=578..605
+x=371, y=370..376
+x=415, y=1707..1725
+x=422, y=1010..1021
+x=344, y=862..875
+x=426, y=593..601
+y=1649, x=382..402
+x=362, y=861..875
+x=610, y=1040..1061
+x=310, y=1632..1653
+y=1458, x=304..309
+x=576, y=895..902
+y=224, x=503..515
+y=515, x=530..533
+y=306, x=373..387
+x=394, y=212..229
+x=373, y=463..466
+y=97, x=386..405
+y=1297, x=462..473
+x=560, y=366..368
+x=425, y=293..295
+y=60, x=441..456
+x=463, y=1619..1640
+x=412, y=941..944
+x=529, y=774..785
+x=505, y=250..266
+x=504, y=1281..1286
diff --git a/2018/src/day17.rs b/2018/src/day17.rs
index e876bd8..a317fa1 100644
--- a/2018/src/day17.rs
+++ b/2018/src/day17.rs
@@ -1,25 +1,197 @@
 use std::io::Read;
 
 use common::Solution;
+use std::collections::HashSet;
+use regex::Regex;
+use std::io::BufReader;
+use std::io::BufRead;
+use itertools::Itertools;
+use itertools::MinMaxResult;
+
+type Coordinate = (usize, usize);
 
 #[derive(Default)]
-pub struct Day17 {}
+pub struct Day17 {
+    clays: HashSet<Coordinate>,
+    flowing: HashSet<Coordinate>,
+    contained: HashSet<Coordinate>,
+    ymin: usize,
+    ymax: usize,
+}
 
 impl Day17 {
     pub fn new() -> Self {
         Default::default()
     }
+
+    fn read_input(&mut self, input: &mut Read) {
+        let matcher = Regex::new(r"(.)=(\d+), (.)=(\d+)\.\.(\d+)").unwrap();
+        let reader = BufReader::new(input);
+
+        for line in reader.lines() {
+            let line = line.unwrap();
+            let captures = matcher.captures(&line).unwrap();
+
+            let fixed: usize = captures[2].parse().unwrap();
+            let a: usize = captures[4].parse().unwrap();
+            let b: usize = captures[5].parse().unwrap();
+
+            match &captures[1] {
+                "x" => {
+                    for y in a..=b {
+                        self.clays.insert((fixed, y));
+                    }
+                },
+                "y" => {
+                    for x in a..=b {
+                        self.clays.insert((x, fixed));
+                    }
+                }
+                _ => panic!(),
+            }
+        }
+
+        match self.clays.iter().map(|(_, y)| y).minmax() {
+            MinMaxResult::MinMax(a, b) => {
+                self.ymin = *a;
+                self.ymax = *b;
+            },
+            _ => panic!(),
+        };
+    }
+
+    #[allow(unused)]
+    fn map(&self) {
+        let (xmin, xmax) = match self.clays.iter().map(|(x, _)| *x).minmax() {
+            MinMaxResult::MinMax(a, b) => (a, b),
+            _ => panic!(),
+        };
+
+        println!("{}, {} to {}, {}", xmin, self.ymin, xmax, self.ymax);
+
+        for y in self.ymin..=self.ymax {
+            let mut buf = String::with_capacity(xmax - xmin + 1);
+            for x in xmin..=xmax {
+                let pos = (x, y);
+                if self.clays.contains(&pos) {
+                    buf.push('#');
+                } else if self.contained.contains(&pos) {
+                    buf.push('~');
+                } else if self.flowing.contains(&pos) {
+                    buf.push('|');
+                } else {
+                    buf.push(' ');
+                }
+            }
+            println!("{}", buf);
+        }
+    }
+
+    fn descend(&mut self, pos: Coordinate) {
+        let (x, y) = pos;
+
+        if y > self.ymax || self.clays.contains(&pos) || self.flowing.contains(&pos) || self.contained.contains(&pos) {
+            return;
+        }
+
+        let below = (x, y + 1);
+
+        self.descend(below);
+
+        if self.clays.contains(&below) || self.contained.contains(&below) {
+            let mut contained = true;
+
+            let mut layer = vec![pos];
+
+            let mut nx = x + 1;
+            loop {
+                let npos = (nx, y);
+                if self.clays.contains(&npos) {
+                    break;
+                }
+                layer.push(npos);
+
+                let nbelow = (nx, y + 1);
+                self.descend(nbelow);
+                if !self.clays.contains(&nbelow) && !self.contained.contains(&nbelow) {
+                    contained = false;
+                    break;
+                }
+
+                nx += 1;
+            }
+            let mut nx = x - 1;
+            loop {
+                let npos = (nx, y);
+                if self.clays.contains(&npos) {
+                    break;
+                }
+                layer.push(npos);
+
+                let nbelow = (nx, y + 1);
+                self.descend(nbelow);
+                if !self.clays.contains(&nbelow) && !self.contained.contains(&nbelow) {
+                    contained = false;
+                    break;
+                }
+                nx -= 1;
+            }
+
+            if contained {
+                self.contained.extend(layer);
+            } else {
+                self.flowing.extend(layer);
+            }
+        } else {
+            self.flowing.insert(pos);
+        }
+    }
 }
 
 impl Solution for Day17 {
-    fn part1(&mut self, _input: &mut Read) -> String {
-        unimplemented!()
+    fn part1(&mut self, input: &mut Read) -> String {
+        self.read_input(input);
+
+
+        self.descend((500, 0));
+
+        let range_filter = |&&(_, y): &&(usize, usize)| y >= self.ymin && y <= self.ymax;
+
+        let result = self.contained.iter().filter(range_filter).count()
+            + self.flowing.iter().filter(range_filter).count();
+        format!("{}", result)
     }
 
-    fn part2(&mut self, _input: &mut Read) -> String {
-        unimplemented!()
+    fn part2(&mut self, input: &mut Read) -> String {
+        self.read_input(input);
+
+
+        self.descend((500, 0));
+
+        let range_filter = |&&(_, y): &&(usize, usize)| y >= self.ymin && y <= self.ymax;
+
+        let result = self.contained.iter().filter(range_filter).count();
+        format!("{}", result)
     }
 }
 
 #[cfg(test)]
-mod tests {}
+mod tests {
+    use day17::Day17;
+    use common::Solution;
+
+    const SAMPLE_INPUT: &[u8] = include_bytes!("samples/17.txt");
+
+    #[test]
+    fn sample_part1() {
+        let mut instance = Day17::new();
+        assert_eq!("57", instance.part1(&mut SAMPLE_INPUT));
+    }
+
+    #[test]
+    fn sample_part2() {
+        let mut instance = Day17::new();
+        assert_eq!("29", instance.part2(&mut SAMPLE_INPUT));
+    }
+
+}
diff --git a/2018/src/samples/17.txt b/2018/src/samples/17.txt
new file mode 100644
index 0000000..293b5af
--- /dev/null
+++ b/2018/src/samples/17.txt
@@ -0,0 +1,8 @@
+x=495, y=2..7
+y=7, x=495..501
+x=501, y=3..7
+x=498, y=2..4
+x=506, y=1..2
+x=498, y=10..13
+x=504, y=10..13
+y=13, x=498..504