27 lines
659 B
Python
27 lines
659 B
Python
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def perm1(n):
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a = list(range(n))
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def sub(i):
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if i == n - 1:
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yield tuple(a)
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else:
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for k in range(i, n):
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a[i], a[k] = a[k], a[i]
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yield from sub(i + 1)
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a[i], a[k] = a[k], a[i]
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yield from sub(0)
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def perm2(n):
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a = list(range(n))
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def sub(i):
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if i == n - 1:
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yield tuple(a)
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else:
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for k in range(i, n):
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a[i], a[k] = a[k], a[i]
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yield from sub(i + 1)
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x = a[i]
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for k in range(i + 1, n):
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a[k - 1] = a[k]
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a[n - 1] = x
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yield from sub(0)
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