38 lines
2.1 KiB
Haskell
38 lines
2.1 KiB
Haskell
|
#! /usr/bin/env -S"ANSWER=42" nix-shell
|
||
|
|
#! nix-shell -p ghcid
|
||
|
|
#! nix-shell -p "haskellPackages.ghcWithPackages (p: with p; [shower])"
|
||
|
|
#! nix-shell -i "ghcid -c 'ghci -Wall' -T main"
|
||
|
|
|
||
|
|
{-# LANGUAGE OverloadedStrings #-}
|
||
|
|
|
||
|
|
-- [...] find the two entries that sum to 2020 and then multiply those two
|
||
|
|
-- numbers together.
|
||
|
|
|
||
|
|
testData :: [Int]
|
||
|
|
testData = [ 1721 , 979 , 366 , 299 , 675 , 1456 ]
|
||
|
|
|
||
|
|
realData :: [Int]
|
||
|
|
realData = [ 1977 , 1802 , 1856 , 1309 , 2003 , 1854 , 1898 , 1862 , 1857 , 542 , 1616 , 1599 , 1628 , 1511 , 1848 , 1623 , 1959 , 1693 , 1444 , 1211 , 1551 , 1399 , 1855 , 1538 , 1869 , 1664 , 1719 , 1241 , 1875 , 1733 , 1547 , 1813 , 1531 , 1773 , 624 , 1336 , 1897 , 1179 , 1258 , 1205 , 1727 , 1364 , 1957 , 540 , 1970 , 1273 , 1621 , 1964 , 1723 , 1699 , 1847 , 1249 , 1254 , 1644 , 1449 , 1794 , 1797 , 1713 , 1534 , 1202 , 1951 , 1598 , 1926 , 1865 , 1294 , 1893 , 1641 , 1325 , 1432 , 1960 , 413 , 1517 , 1724 , 1715 , 1458 , 1775 , 1317 , 1694 , 1484 , 1840 , 1999 , 1811 , 1578 , 1658 , 1906 , 1481 , 1313 , 1997 , 1339 , 1592 , 1971 , 1453 , 1706 , 1884 , 1956 , 1384 , 1579 , 1689 , 1726 , 1217 , 1796 , 1536 , 1213 , 1867 , 1304 , 2010 , 1503 , 1665 , 1361 , 814 , 2007 , 1430 , 1625 , 1958 , 860 , 1799 , 1942 , 1876 , 1772 , 1198 , 1221 , 1814 , 1826 , 1667 , 1334 , 1504 , 1420 , 1164 , 1414 , 1934 , 1823 , 1507 , 1195 , 21 , 1752 , 1472 , 1196 , 1558 , 1322 , 1927 , 1556 , 1922 , 277 , 1828 , 1883 , 1280 , 1947 , 1231 , 1915 , 1235 , 1961 , 1494 , 1324 , 2009 , 1367 , 1545 , 1736 , 1575 , 1214 , 1704 , 1833 , 1663 , 1474 , 1894 , 1754 , 1564 , 1321 , 1119 , 1975 , 1987 , 1873 , 1834 , 1686 , 1574 , 1505 , 1656 , 1688 , 1896 , 1982 , 1554 , 1990 , 1902 , 1859 , 1293 , 1739 , 1282 , 1889 , 1981 , 1283 , 1687 , 1220 , 1443 , 1409 , 1252 , 1506 , 1742 , 1319 , 1882 , 951 , 1849 ]
|
||
|
|
|
||
|
|
solve1 :: [Int] -> Maybe Int
|
||
|
|
solve1 l = lookup 2020 $ do
|
||
|
|
x <- l
|
||
|
|
y <- l
|
||
|
|
pure (x+y,x*y)
|
||
|
|
|
||
|
|
solve2 :: [Int] -> Maybe Int
|
||
|
|
solve2 l = lookup 2020 $ do
|
||
|
|
x <- l
|
||
|
|
y <- l
|
||
|
|
z <- l
|
||
|
|
pure (x+y+z,x*y*z)
|
||
|
|
|
||
|
|
main :: IO ()
|
||
|
|
main = do
|
||
|
|
putStrLn "Day 1 - Part 1"
|
||
|
|
print $ solve1 testData
|
||
|
|
print $ solve1 realData
|
||
|
|
putStrLn "Day 1 - Part 2"
|
||
|
|
print $ solve2 testData
|
||
|
|
print $ solve2 realData
|