17 lines
511 B
Haskell
17 lines
511 B
Haskell
module Homework.Ch01.TowerOfHanoi where
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type Peg = String
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type Move = (Peg, Peg)
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hanoi :: Integer -> Peg -> Peg -> Peg -> [Move]
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hanoi n x y z = runHanoi [] (reverse $ initStack n) [] []
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where
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initStack 0 = []
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initStack xx = xx : initStack (xx - 1)
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runHanoi moves (itemX : stackX) [] [] = runHanoi ((x, z) : moves) stackX [] [itemX]
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runHanoi moves (itemX : stackX) [] (itemZ : stackZ)
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| itemX > itemZ = runHanoi ((x, y) : moves) stackX [itemX] (itemZ : stackZ)
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runHanoi moves ()
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