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tamurashingo/gist:5018596

Created February 23, 2013 05:31
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Project Euler 6
Raw
gistfile1.hs
{-
1～100までの二乗の和と、1～100までの和の二乗との差分を求める。
1～100までの二乗の和
foldl (+) 0 $ map (^ 2) [1..100]
1～100までの和の二乗
(^ 2) $ foldl (+) 0 [1..100]
-}
let
a = foldl (+) 0 $ map (^ 2) [1..100]
b = (^ 2) $ foldl (+) 0 [1..100]
in
b - a
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