commit 5b353b68a840daca4ee6e7184ad6adf642a747e5
Author: Misaka Mikoto <4C2BOA6SRQM4VM4I6RNIKOM6W@cybercat.cc>
Date:   Wed Dec 2 14:06:06 2020 +0200

    initial

diff --git a/2020/1 b/2020/1
new file mode 100644
index 0000000..f62a091
--- /dev/null
+++ b/2020/1
@@ -0,0 +1,200 @@
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diff --git a/2020/1.hs b/2020/1.hs
new file mode 100644
index 0000000..8cb128b
--- /dev/null
+++ b/2020/1.hs
@@ -0,0 +1,5 @@
+main = readFile "1" >>= putStrLn . show . f . g . map (\x -> read x :: Integer) . lines
+  where f (x:_,  y:_)  | x + y == 2020 = x * y
+        f (x:xs, _:ys)                 = f (x:xs, ys)
+        f (_:xs, [])                   = f $ g xs
+        g (x:xs) = (x:xs, xs)
diff --git a/2020/2 b/2020/2
new file mode 100644
index 0000000..bb32789
--- /dev/null
+++ b/2020/2
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+2-3 n: xnjnl
+2-9 f: ffffxffff
+5-6 g: sgggjzg
+7-10 h: zlvnhhrhlz
+10-11 h: hhhhhhrhhhhhh
+6-7 k: kpvtkkkk
+9-17 b: vbbwhjntdzhbbhmbbq
+6-8 h: hlhhhhrdjncphc
diff --git a/2020/2.hs b/2020/2.hs
new file mode 100644
index 0000000..cb2d5a6
--- /dev/null
+++ b/2020/2.hs
@@ -0,0 +1,16 @@
+import Data.Char
+
+data Entry = MkEntry { min :: Integer
+                     , max :: Integer
+                     , chr :: Char
+                     , pass :: String
+                     }
+
+count x = length . filter ((==) x)
+main = readFile "2" >>= putStrLn . show . length . filter (parse 0 0) . lines
+  where valid min max chr pass = let x = count chr pass
+                                 in
+                                   x >= min && x <= max
+        parse min tmpnum ('-':xs)           = parse tmpnum 0 xs
+        parse min tmpnum (' ':x:':':' ':xs) = valid min tmpnum x xs
+        parse min tmpnum (x:xs)             = parse min (tmpnum * 10 + digitToInt x) xs