2 files changed, 2053 insertions, 0 deletions

diff --git a/2017/input/day12.txt b/2017/input/day12.txt
new file mode 100644
index 0000000..c7d421c
--- /dev/null
+++ b/2017/input/day12.txt
@@ -0,0 +1,2000 @@
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+1570 <-> 929, 1044, 1833
+1571 <-> 1472
+1572 <-> 200, 267, 1405
+1573 <-> 867, 1122
+1574 <-> 253
+1575 <-> 589, 1427, 1622, 1705
+1576 <-> 826
+1577 <-> 1780
+1578 <-> 386
+1579 <-> 1579
+1580 <-> 1699
+1581 <-> 1428
+1582 <-> 60, 717
+1583 <-> 1583
+1584 <-> 408
+1585 <-> 1585
+1586 <-> 735
+1587 <-> 975, 1258, 1587, 1619
+1588 <-> 1249, 1478
+1589 <-> 549, 728, 1237
+1590 <-> 951, 1237, 1356
+1591 <-> 70, 1639
+1592 <-> 1592, 1992
+1593 <-> 63, 78, 1138, 1522
+1594 <-> 1323, 1567
+1595 <-> 1966
+1596 <-> 947
+1597 <-> 533, 702
+1598 <-> 648, 1615
+1599 <-> 1622, 1694
+1600 <-> 356, 402, 1494
+1601 <-> 1023, 1415
+1602 <-> 240, 614, 1813, 1925
+1603 <-> 1645
+1604 <-> 1969
+1605 <-> 106
+1606 <-> 381, 1123
+1607 <-> 423
+1608 <-> 801
+1609 <-> 968, 1684
+1610 <-> 8, 269
+1611 <-> 1840
+1612 <-> 1542, 1933
+1613 <-> 704, 1725
+1614 <-> 503, 847
+1615 <-> 75, 1598
+1616 <-> 907, 1115
+1617 <-> 635, 935, 1076, 1115
+1618 <-> 1407, 1559
+1619 <-> 93, 1193, 1587
+1620 <-> 538, 1493
+1621 <-> 798, 1672, 1911
+1622 <-> 306, 1575, 1599
+1623 <-> 528, 806, 964
+1624 <-> 1403, 1989
+1625 <-> 736, 1185
+1626 <-> 1210, 1417
+1627 <-> 1, 160, 674
+1628 <-> 1844
+1629 <-> 173, 1441, 1930
+1630 <-> 86, 350, 433, 576
+1631 <-> 613
+1632 <-> 583, 788
+1633 <-> 1452
+1634 <-> 1563
+1635 <-> 922
+1636 <-> 1077, 1166, 1636
+1637 <-> 17, 1156, 1267
+1638 <-> 1306
+1639 <-> 333, 1591
+1640 <-> 1640
+1641 <-> 960
+1642 <-> 765, 932, 1510
+1643 <-> 317, 810, 881
+1644 <-> 522
+1645 <-> 1603, 1719
+1646 <-> 1009, 1355
+1647 <-> 284, 1485
+1648 <-> 706, 1785
+1649 <-> 940, 1017
+1650 <-> 1170
+1651 <-> 1385
+1652 <-> 39, 969, 1182, 1652
+1653 <-> 246, 637, 1919
+1654 <-> 380, 1137, 1923
+1655 <-> 324
+1656 <-> 1986
+1657 <-> 610, 1067
+1658 <-> 1281
+1659 <-> 1305
+1660 <-> 1224, 1869
+1661 <-> 1225
+1662 <-> 50, 1247
+1663 <-> 313
+1664 <-> 885, 1302, 1870
+1665 <-> 1206
+1666 <-> 927, 1063, 1903
+1667 <-> 1164
+1668 <-> 158, 1989
+1669 <-> 1134, 1283, 1293, 1669
+1670 <-> 387, 593, 1884
+1671 <-> 689, 982
+1672 <-> 612, 955, 1621
+1673 <-> 690, 1097
+1674 <-> 746, 1288
+1675 <-> 582, 1675
+1676 <-> 124, 1129
+1677 <-> 24, 455, 1979
+1678 <-> 363, 878, 1123
+1679 <-> 1, 156, 542, 562, 1247
+1680 <-> 587
+1681 <-> 208, 812
+1682 <-> 1329
+1683 <-> 1225
+1684 <-> 739, 1609
+1685 <-> 710
+1686 <-> 1027, 1147, 1939
+1687 <-> 238, 708, 1740
+1688 <-> 268
+1689 <-> 981, 1290, 1814
+1690 <-> 1148
+1691 <-> 998
+1692 <-> 893, 1862
+1693 <-> 397, 763, 1538
+1694 <-> 740, 1599
+1695 <-> 1695
+1696 <-> 131, 135, 1427
+1697 <-> 404, 1512
+1698 <-> 482, 1930
+1699 <-> 514, 1025, 1580
+1700 <-> 321, 331, 1945
+1701 <-> 1749
+1702 <-> 1702
+1703 <-> 1444
+1704 <-> 61, 761
+1705 <-> 1575
+1706 <-> 1706
+1707 <-> 972, 1406
+1708 <-> 23, 1791
+1709 <-> 878
+1710 <-> 148
+1711 <-> 1848
+1712 <-> 397
+1713 <-> 1899
+1714 <-> 516, 1860
+1715 <-> 1715
+1716 <-> 781
+1717 <-> 243, 417, 471
+1718 <-> 1416, 1460, 1785
+1719 <-> 1045, 1645, 1719
+1720 <-> 857, 1104
+1721 <-> 1971
+1722 <-> 1742, 1998
+1723 <-> 85, 899, 1320, 1506
+1724 <-> 807, 1183
+1725 <-> 552, 1613
+1726 <-> 495, 663, 813
+1727 <-> 1727
+1728 <-> 281, 492
+1729 <-> 451
+1730 <-> 474, 832, 1317
+1731 <-> 1858
+1732 <-> 691, 1493
+1733 <-> 646, 1299, 1413, 1733
+1734 <-> 750, 1183
+1735 <-> 446
+1736 <-> 443
+1737 <-> 740
+1738 <-> 137, 286, 969
+1739 <-> 1075
+1740 <-> 1687, 1942
+1741 <-> 1207
+1742 <-> 1536, 1722, 1742
+1743 <-> 248, 1180, 1743
+1744 <-> 130, 908, 1744
+1745 <-> 1745
+1746 <-> 850
+1747 <-> 1524, 1747
+1748 <-> 186, 1748
+1749 <-> 654, 1288, 1701, 1871
+1750 <-> 787
+1751 <-> 1751
+1752 <-> 571
+1753 <-> 1753
+1754 <-> 1754
+1755 <-> 731, 835, 921, 1049, 1324, 1350
+1756 <-> 1935
+1757 <-> 486, 1224
+1758 <-> 1346, 1541
+1759 <-> 196, 842
+1760 <-> 163, 729, 1125
+1761 <-> 170
+1762 <-> 891
+1763 <-> 410, 1763
+1764 <-> 309
+1765 <-> 1368
+1766 <-> 1031
+1767 <-> 898, 1955
+1768 <-> 360, 965
+1769 <-> 160
+1770 <-> 1079, 1868
+1771 <-> 575, 786
+1772 <-> 332
+1773 <-> 51, 910
+1774 <-> 347, 1122, 1130
+1775 <-> 1210
+1776 <-> 762, 1776
+1777 <-> 1948
+1778 <-> 833
+1779 <-> 571, 1435, 1779
+1780 <-> 434, 664, 1577
+1781 <-> 1958
+1782 <-> 147, 1106, 1397
+1783 <-> 1846
+1784 <-> 1784, 1866
+1785 <-> 1648, 1718, 1937
+1786 <-> 871
+1787 <-> 271, 1041
+1788 <-> 1295, 1962
+1789 <-> 1789
+1790 <-> 457, 638, 784
+1791 <-> 1708, 1791
+1792 <-> 1468
+1793 <-> 420
+1794 <-> 721
+1795 <-> 174, 614
+1796 <-> 852, 1414
+1797 <-> 511
+1798 <-> 107, 1427
+1799 <-> 812, 1109
+1800 <-> 988
+1801 <-> 684
+1802 <-> 670
+1803 <-> 1081, 1083
+1804 <-> 462
+1805 <-> 1236, 1409
+1806 <-> 789
+1807 <-> 1212, 1267
+1808 <-> 1841
+1809 <-> 1519, 1947
+1810 <-> 108, 453, 1167, 1943
+1811 <-> 139, 581, 734, 1955
+1812 <-> 1225, 1281, 1812
+1813 <-> 1602
+1814 <-> 1689
+1815 <-> 378
+1816 <-> 796, 1314
+1817 <-> 601, 1451
+1818 <-> 357
+1819 <-> 200, 1858
+1820 <-> 1834, 1904
+1821 <-> 1821
+1822 <-> 10, 859
+1823 <-> 694, 801, 864
+1824 <-> 353, 713, 909
+1825 <-> 224, 357
+1826 <-> 254, 1230
+1827 <-> 739, 793, 1221
+1828 <-> 1004, 1948
+1829 <-> 373
+1830 <-> 980
+1831 <-> 1831
+1832 <-> 140
+1833 <-> 1570
+1834 <-> 290, 1820
+1835 <-> 472, 1008
+1836 <-> 1420, 1963
+1837 <-> 1352
+1838 <-> 495
+1839 <-> 960
+1840 <-> 789, 1089, 1611
+1841 <-> 340, 1808
+1842 <-> 65, 1253
+1843 <-> 296
+1844 <-> 302, 1628
+1845 <-> 432, 892, 1971
+1846 <-> 330, 669, 1004, 1783
+1847 <-> 525
+1848 <-> 169, 996, 1304, 1711
+1849 <-> 57, 96
+1850 <-> 1517, 1972
+1851 <-> 32, 657
+1852 <-> 518
+1853 <-> 436, 692, 1042
+1854 <-> 354, 1854
+1855 <-> 619, 1855, 1893
+1856 <-> 745
+1857 <-> 1310
+1858 <-> 1458, 1731, 1819
+1859 <-> 555, 1004
+1860 <-> 440, 1714
+1861 <-> 228, 814
+1862 <-> 722, 1464, 1692
+1863 <-> 509
+1864 <-> 930, 1265, 1326
+1865 <-> 1552
+1866 <-> 389, 1784
+1867 <-> 1285, 1918
+1868 <-> 578, 1770, 1957
+1869 <-> 1660
+1870 <-> 672, 1664
+1871 <-> 799, 1006, 1749
+1872 <-> 1088
+1873 <-> 52, 569
+1874 <-> 1896
+1875 <-> 715, 963, 1177
+1876 <-> 94, 1189
+1877 <-> 392, 1371, 1484
+1878 <-> 41, 579, 1471
+1879 <-> 652
+1880 <-> 1162, 1880
+1881 <-> 1236
+1882 <-> 1299, 1349
+1883 <-> 482
+1884 <-> 348, 1670
+1885 <-> 757
+1886 <-> 117, 737, 1463
+1887 <-> 934, 1178
+1888 <-> 717
+1889 <-> 1899
+1890 <-> 754, 1201
+1891 <-> 155, 504
+1892 <-> 446, 507
+1893 <-> 1855
+1894 <-> 182
+1895 <-> 378, 650
+1896 <-> 524, 1874
+1897 <-> 1922
+1898 <-> 446
+1899 <-> 1713, 1889, 1899
+1900 <-> 1900
+1901 <-> 1295
+1902 <-> 247
+1903 <-> 37, 862, 1666
+1904 <-> 1820
+1905 <-> 502
+1906 <-> 294, 978
+1907 <-> 526, 566, 1128, 1348, 1400, 1546
+1908 <-> 1908
+1909 <-> 995, 1021, 1354
+1910 <-> 407
+1911 <-> 1204, 1621
+1912 <-> 647, 814, 852, 1016, 1262
+1913 <-> 565, 938, 1331
+1914 <-> 1126
+1915 <-> 411, 456, 1551
+1916 <-> 211
+1917 <-> 1033, 1946
+1918 <-> 1867
+1919 <-> 901, 1653
+1920 <-> 278, 653
+1921 <-> 47
+1922 <-> 1433, 1897
+1923 <-> 1654
+1924 <-> 339
+1925 <-> 1602, 1951
+1926 <-> 352, 1294
+1927 <-> 684, 1348
+1928 <-> 975
+1929 <-> 781, 899
+1930 <-> 1475, 1629, 1698
+1931 <-> 949
+1932 <-> 977
+1933 <-> 1059, 1087, 1612
+1934 <-> 756, 1934
+1935 <-> 145, 1448, 1756
+1936 <-> 379
+1937 <-> 1785
+1938 <-> 1547
+1939 <-> 532, 1686
+1940 <-> 429
+1941 <-> 431
+1942 <-> 1740, 1942
+1943 <-> 1064, 1810
+1944 <-> 1015
+1945 <-> 409, 1057, 1398, 1700
+1946 <-> 592, 601, 690, 1917
+1947 <-> 1423, 1809
+1948 <-> 883, 895, 1777, 1828
+1949 <-> 1949
+1950 <-> 1950
+1951 <-> 65, 1031, 1925
+1952 <-> 327
+1953 <-> 1323
+1954 <-> 15, 630, 1155
+1955 <-> 277, 1767, 1811
+1956 <-> 522, 900
+1957 <-> 1044, 1196, 1868
+1958 <-> 1340, 1506, 1781
+1959 <-> 125, 679
+1960 <-> 57, 194, 534, 863, 1960
+1961 <-> 1028
+1962 <-> 781, 1018, 1788
+1963 <-> 372, 1186, 1368, 1836
+1964 <-> 1012, 1964
+1965 <-> 484, 784
+1966 <-> 527, 1595
+1967 <-> 1431, 1967
+1968 <-> 587
+1969 <-> 656, 1604
+1970 <-> 882
+1971 <-> 539, 1280, 1416, 1721, 1845
+1972 <-> 889, 1039, 1186, 1850
+1973 <-> 251, 332, 629
+1974 <-> 1183
+1975 <-> 1975
+1976 <-> 1011
+1977 <-> 174, 579
+1978 <-> 662, 1282
+1979 <-> 205, 1065, 1074, 1677
+1980 <-> 268, 549, 833, 1143
+1981 <-> 786, 928
+1982 <-> 634, 1539
+1983 <-> 35, 1983
+1984 <-> 1984
+1985 <-> 477, 1985
+1986 <-> 257, 1656, 1986
+1987 <-> 1987
+1988 <-> 825
+1989 <-> 1624, 1668
+1990 <-> 1357
+1991 <-> 66, 738, 905, 1467
+1992 <-> 744, 950, 1592
+1993 <-> 779
+1994 <-> 326
+1995 <-> 1463
+1996 <-> 713
+1997 <-> 90, 513
+1998 <-> 447, 1500, 1722
+1999 <-> 12, 1537
\ No newline at end of file
diff --git a/2017/src/bin/day12.rs b/2017/src/bin/day12.rs
new file mode 100644
index 0000000..b133ba6
--- /dev/null
+++ b/2017/src/bin/day12.rs
@@ -0,0 +1,53 @@
+use std::collections::{HashMap, HashSet};
+use std::io::{self, Read};
+
+fn solve1(input: &str) -> usize {
+    let mut pipes: HashMap<u32, Vec<u32>> = HashMap::new();
+    for line in input.lines() {
+        let mut words = line.split_whitespace();
+        let src = words.next().unwrap().parse().unwrap();
+        assert_eq!(Some("<->"), words.next());
+        for dest in words {
+            let dest = dest.trim_right_matches(',').parse().unwrap();
+            pipes.entry(src).or_insert(vec![]).push(dest);
+            pipes.entry(dest).or_insert(vec![]).push(src);
+        }
+    }
+
+    let mut group = HashSet::new();
+    group.insert(0);
+
+    let mut prev = None;
+    while Some(group.len()) != prev {
+        prev = Some(group.len());
+        for (src, dests) in &pipes {
+            if group.contains(src) {
+                group.extend(dests);
+            }
+        }
+    }
+
+    group.len()
+}
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    println!("Part 1: {}", solve1(&input));
+}
+
+#[test]
+fn part1() {
+    assert_eq!(6, solve1(
+"\
+0 <-> 2
+1 <-> 1
+2 <-> 0, 3, 4
+3 <-> 2, 4
+4 <-> 2, 3, 6
+5 <-> 6
+6 <-> 4, 5
+"
+    ));
+}