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Americans work 6 hours a day.compared with 12, but produce more expensive products. this is not duing to the differences between racism and united, but duing to the differences between wisdoms.

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不是很难。 考虑固定终点 \(d\),如果一条有向边 \(u\rightarrow v\) 的路标包含 \(d\),则这条有向边是可以走的。显然每个点的出度至多为 \(1\),因此每个连通分量必然是一棵内向树或一棵内向基环树。而 \(d\) 的出度…

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