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https://github.com/osmarks/random-stuff
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25 lines
529 B
Python
25 lines
529 B
Python
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import math, itertools
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count = 0
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for permutation in itertools.permutations(range(7)):
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perm = [
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list(range(7)),
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list(permutation)
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]
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perm = dict(zip(*perm))
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vals = set(perm)
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print(perm)
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cycs = []
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while vals:
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nxt = vals.pop()
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seen = []
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while nxt not in seen:
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lnxt = nxt
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nxt = perm[nxt]
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seen.append(lnxt)
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cycs.append(seen)
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vals -= set(seen)
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if math.lcm(*map(len, cycs)) == 4:
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count += 1
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print(count)
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