Initial work on day 22.

2019/inputs/22.txt

@@ -0,0 +1,100 @@
+cut -8737
+deal with increment 36
+deal into new stack
+deal with increment 32
+cut -3856
+deal with increment 27
+deal into new stack
+cut 8319
+deal with increment 15
+deal into new stack
+deal with increment 53
+cut 2157
+deal with increment 3
+deal into new stack
+cut 9112
+deal with increment 59
+cut 957
+deal with increment 28
+cut -9423
+deal with increment 51
+deal into new stack
+deal with increment 8
+cut 3168
+deal with increment 16
+cut 6558
+deal with increment 32
+deal into new stack
+cut -8246
+deal with increment 40
+cut 4405
+deal with increment 9
+cut -2225
+deal with increment 36
+cut -5080
+deal with increment 59
+cut -648
+deal with increment 64
+cut -1845
+deal into new stack
+cut -7726
+deal with increment 44
+cut 1015
+deal with increment 12
+cut 960
+deal with increment 30
+deal into new stack
+deal with increment 65
+deal into new stack
+deal with increment 27
+cut 6877
+deal with increment 5
+deal into new stack
+cut -3436
+deal with increment 63
+deal into new stack
+deal with increment 71
+deal into new stack
+deal with increment 7
+cut -9203
+deal with increment 38
+cut 9008
+deal with increment 59
+deal into new stack
+deal with increment 13
+cut 5979
+deal with increment 55
+cut 9483
+deal with increment 65
+cut -9250
+deal with increment 75
+deal into new stack
+cut -1830
+deal with increment 55
+deal into new stack
+deal with increment 67
+cut -8044
+deal into new stack
+cut 8271
+deal with increment 51
+cut 6002
+deal into new stack
+deal with increment 47
+cut 3638
+deal with increment 18
+cut -785
+deal with increment 63
+cut -2460
+deal with increment 25
+cut 5339
+deal with increment 61
+cut -5777
+deal with increment 54
+deal into new stack
+cut 8075
+deal into new stack
+deal with increment 22
+cut 3443
+deal with increment 34
+cut 5193
+deal with increment 3

2019/src/day22.cpp

@@ -1,7 +1,30 @@
 #include <iostream>
 #include "days.hpp"
+#include "utils.hpp"
 
 void aoc2019::day22_part1(std::istream &input, std::ostream &output) {
+    std::int64_t increment = 1;
+    std::int64_t offset = 0;
+
+    constexpr std::int64_t DECK_SIZE = 10007;
+
+    std::string buffer;
+    while (std::getline(input, buffer)) {
+        std::string_view line = buffer;
+        if (!line.find("deal into new stack")) {
+            increment *= -1;
+        } else if (!line.find("deal with increment ")) {
+            std::int64_t new_increment;
+            from_chars(line.substr(20), new_increment);
+            increment *= new_increment;
+            increment %= DECK_SIZE;
+        } else {
+            std::int64_t new_offset;
+            from_chars(line, new_offset);
+            offset += increment * new_offset;
+            offset %= DECK_SIZE;
+        }
+    }
 	output << "Not implemented\n";
 }