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| -rw-r--r-- | challenge-112/ulrich-rieke/haskell/ch-2.hs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/challenge-112/ulrich-rieke/haskell/ch-2.hs b/challenge-112/ulrich-rieke/haskell/ch-2.hs new file mode 100644 index 0000000000..9c935587e8 --- /dev/null +++ b/challenge-112/ulrich-rieke/haskell/ch-2.hs @@ -0,0 +1,8 @@ +module Challenge112 + where +import Data.List ( permutations , nub ) + +stepcounter :: Int -> Int +stepcounter n = length $ concat $ map (nub . permutations) [ replicate t 1 ++ + replicate o 2 | t <- [0 .. n] , o <- [0 .. div n 2] , sum ( replicate t 1 ++ + replicate o 2 ) == n] |