[HackerEarth] All roads of Byteland have been destroyed by a recent epic fight between good and evil. Unfortunately, the citizens need to get back to work and need to rebuild their road network. - 题解

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题目信息
题号 P15821
标题 [HackerEarth] All roads of Byteland have been destroyed by a recent epic fight between good and evil. Unfortunately, the citizens need to get back to work and need to rebuild their road network.
难度 普及-
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