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我发现一个问题了。。Each of the next at most N lines contains the number of a place followed by the numbers of some places to which there is a direct line from this place. 注意这句话的“at most N lines”，数据根本不是这样的，我开始写了一个语句 for(i=0;i<n;i++) WA了，不考虑这个at most这个条件后却A了。。 Followed by:
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