[HackerEarth] There are N toffies in a room labelled from 1 to N and there are N - 1 directed path between these toffies such that every toffy has at least 1 path leading to the toffy or away from it - 题解

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题目信息
题号 P14011
标题 [HackerEarth] There are N toffies in a room labelled from 1 to N and there are N - 1 directed path between these toffies such that every toffy has at least 1 path leading to the toffy or away from it
难度 普及
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