13 lines
324 B
Python
13 lines
324 B
Python
def char_and_rest(i, xs):
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return xs[i], xs[:i] + xs[i+1:]
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# perms :: String -> [String]
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def perms(xs):
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if len(xs) == 1:
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return [xs]
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result = []
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for c, rest in [char_and_rest(i, xs) for i in range(len(xs))]:
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result += [c + perm for perm in perms(rest)]
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return result
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print(perms("cat"))
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