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给后来者提个醒这是我WA几次的原因： 1.题目没有说酋长的等级是最高的！若酋长的等级为L0，路径中其他人的等级有可能是[L0-m,L0]，也有可能是[L0,L0+m]，或者这两者之间的任意一个区间，需要一一枚举！ 2.本题是有向图而非无向图！ Followed by:
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