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我不知道你所说的棘手是什么,但如果你从未打过结,你应该尝试使用打结进行迭代深度优先搜索(并确保如果没有找到解决方案,它会干净地终止!)。
I don't know what you call tricky, but if you've never tied the knot you should try to make iterative depth first search using knot tying (and make sure it terminates cleanly if no solution is found!).
尝试找出程序此处终止的原因。
Try to figure out why the programs here terminate.
这与 monad 无关,但这些20 个中级 Haskell 练习可以让你度过一个愉快的夜晚。
It's not about monads, but these 20 intermediate haskell exercises could make your evening.
http://www.haskell.org/haskellwiki/Blow_your_mind
http://www.haskell.org/haskellwiki/Blow_your_mind