[HackerEarth] Prakhar lives in Avartanland. Avartanland consists of N vertices and N-1 directed edges. i-th edge is a directed edge either from i-th vertex to i+1-th vertex or from i+1-th vertex to i- - 题解

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题目信息
题号 P15097
标题 [HackerEarth] Prakhar lives in Avartanland. Avartanland consists of N vertices and N-1 directed edges. i-th edge is a directed edge either from i-th vertex to i+1-th vertex or from i+1-th vertex to i-
难度 普及
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