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因为数据实在是太小了，所以传递闭包暴力。传递闭包保证了可以充分利用已知的信息。 最后判定的时候只需要关注f[i,j]与f[j,i]的关系以及每个点出度（就是已知有几个比这个点更大）和即可。 Followed by:
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