Data commit

Task/Bin-given-limits/Haskell/bin-given-limits-1.hs

@@ -0,0 +1,11 @@
+import Control.Monad (foldM)
+import Data.List (partition)
+
+binSplit :: Ord a => [a] -> [a] -> [[a]]
+binSplit lims ns = counts ++ [rest]
+  where
+    (counts, rest) = foldM split ns lims
+    split l i = let (a, b) = partition (< i) l in ([a], b)
+
+binCounts :: Ord a => [a] -> [a] -> [Int]
+binCounts b = fmap length . binSplit b

Task/Bin-given-limits/Haskell/bin-given-limits-2.hs

@@ -0,0 +1,22 @@
+{-# language DeriveFoldable #-}
+
+import Data.Foldable (toList)
+
+data BTree a b = Node a (BTree a b) (BTree a b)
+               | Val b
+  deriving Foldable
+
+-- assuming list is sorted.
+mkTree :: [a] -> BTree a [a]
+mkTree [] = Val []
+mkTree [x] = Node x (Val []) (Val [])
+mkTree lst = Node x (mkTree l) (mkTree r)
+  where (l, x:r) = splitAt (length lst `div` 2) lst
+
+binSplit :: Ord a => [a] -> [a] -> [[a]]
+binSplit lims = toList . foldr add (mkTree lims)
+  where
+    add x (Val v) = Val (x:v)
+    add x (Node y l r) = if x < y
+                         then Node y (add x l) r
+                         else Node y l (add x r)

Task/Bin-given-limits/Haskell/bin-given-limits-3.hs

@@ -0,0 +1,35 @@
+import Text.Printf
+
+task bs ns = mapM_ putStrLn
+           $ zipWith mkLine (binCounts bs ns) bins
+  where
+    bins :: [String]
+    bins = [printf "(-∞, %v)" $ head bs] <>
+           zipWith mkInterval bs (tail bs) <>
+           [printf "[%v, ∞)" $ last bs]
+
+    mkLine = printf "%v\t in %s"
+    mkInterval = printf "[%v, %v)"
+
+bins1 = [23, 37, 43, 53, 67, 83]
+data1 = [ 95, 21, 94, 12, 99, 4,  70, 75, 83, 93, 52, 80, 57
+        , 5,  53, 86, 65, 17, 92, 83, 71, 61, 54, 58, 47, 16
+        , 8,  9,  32, 84, 7,  87, 46, 19, 30, 37, 96, 6,  98
+        , 40, 79, 97, 45, 64, 60, 29, 49, 36, 43, 55]
+
+bins2 = [14, 18, 249, 312, 389, 392, 513, 591, 634, 720]
+data2 = [ 445, 814, 519, 697, 700, 130, 255, 889, 481, 122, 932, 77,  323, 525
+        , 570, 219, 367, 523, 442, 933, 416, 589, 930, 373, 202, 253, 775, 47
+        , 731, 685, 293, 126, 133, 450, 545, 100, 741, 583, 763, 306, 655, 267
+        , 248, 477, 549, 238, 62,  678, 98,  534, 622, 907, 406, 714, 184, 391
+        , 913, 42,  560, 247, 346, 860, 56,  138, 546, 38,  985, 948, 58,  213
+        , 799, 319, 390, 634, 458, 945, 733, 507, 916, 123, 345, 110, 720, 917
+        , 313, 845, 426, 9,   457, 628, 410, 723, 354, 895, 881, 953, 677, 137
+        , 397, 97,  854, 740, 83,  216, 421, 94,  517, 479, 292, 963, 376, 981
+        , 480, 39,  257, 272, 157, 5,   316, 395, 787, 942, 456, 242, 759, 898
+        , 576, 67,  298, 425, 894, 435, 831, 241, 989, 614, 987, 770, 384, 692
+        , 698, 765, 331, 487, 251, 600, 879, 342, 982, 527, 736, 795, 585, 40
+        , 54,  901, 408, 359, 577, 237, 605, 847, 353, 968, 832, 205, 838, 427
+        , 876, 959, 686, 646, 835, 127, 621, 892, 443, 198, 988, 791, 466, 23
+        , 707, 467, 33,  670, 921, 180, 991, 396, 160, 436, 717, 918, 8,   374
+        , 101, 684, 727, 749]