commit f84cea91d568459dc840fd6ad7260ae9f6c19b52
Author: Thorn Avery <s@p7.co.nz>
Date:   Tue Dec 1 20:27:50 2020 +1300

    first commit

diff --git a/day1.hs b/day1.hs
new file mode 100644
index 0000000..e39e3e6
--- /dev/null
+++ b/day1.hs
@@ -0,0 +1,25 @@
+module Main where
+
+main :: IO ()
+main = do
+  raw <- readFile "day1.txt"
+  let ls = map read $ lines raw :: [Integer]
+   in do
+     case (solveA ls) of
+       Nothing -> error "no answer"
+       (Just x) -> putStrLn $ "day1a: " ++ (show x)
+     case (solveB ls) of
+       Nothing -> error "no answer"
+       (Just x) -> putStrLn $ "day1b: " ++ (show x)
+
+solveA :: [Integer] -> Maybe Integer
+solveA [] = Nothing
+solveA xs = Just $ (\(x,y) -> x * y) lsa
+  where
+    lsa = head [ (x,y) | x <- xs, y <- xs, x + y == 2020 ]
+
+solveB :: [Integer] -> Maybe Integer
+solveB [] = Nothing
+solveB xs = Just $ (\(x,y,z) -> x * y * z) lsb
+  where
+    lsb = head [ (x,y,z) | x <- xs, y <- xs, z <- xs, x + y + z == 2020 ]
diff --git a/day1.txt b/day1.txt
new file mode 100644
index 0000000..f748d3a
--- /dev/null
+++ b/day1.txt
@@ -0,0 +1,200 @@
+1348
+1621
+1500
+1818
+1266
+1449
+1880
+1416
+1862
+1665
+1588
+1704
+1922
+1482
+1679
+1263
+1137
+1045
+1405
+1048
+1619
+1520
+455
+1142
+1415
+1554
+1690
+1886
+1891
+1701
+1915
+1521
+1253
+1580
+1376
+1564
+1747
+1814
+1749
+1485
+1969
+974
+1566
+1413
+1451
+1200
+1558
+1756
+1910
+1044
+470
+1620
+1772
+1066
+1261
+1776
+988
+1976
+1834
+1896
+1646
+1626
+1300
+1692
+1204
+2006
+1265
+1911
+1361
+1766
+1750
+2000
+1824
+1726
+1672
+651
+1226
+1954
+1055
+1999
+1793
+1640
+1567
+1040
+1426
+1717
+1658
+1864
+1917
+695
+1071
+1573
+1897
+1546
+1727
+1801
+1259
+1290
+1481
+1148
+1332
+1262
+1536
+1184
+1821
+1681
+1671
+1612
+1678
+1703
+1604
+1697
+2003
+1453
+1493
+1797
+1180
+1234
+1775
+1859
+1388
+1393
+667
+1767
+1429
+1990
+1322
+1684
+1696
+1565
+1380
+1745
+1685
+1189
+1396
+1593
+1850
+1722
+1495
+1844
+1285
+1483
+1635
+1072
+1947
+1109
+1586
+1730
+1723
+1246
+1389
+1135
+1827
+1531
+1583
+1743
+1958
+183
+1323
+1949
+1799
+1269
+1379
+1950
+1592
+1467
+1052
+1418
+2009
+1227
+1254
+1865
+1609
+1848
+1653
+1691
+1633
+1349
+1104
+1790
+1755
+1847
+1598
+1872
+1478
+1778
+1952
+1694
+1238
+1825
+1508
+1141
+1464
+1838
+1292
+1403
+1365
+1494
+934
+1235