[HackerEarth] Xenny, the traveller, was in AlgoLand for vacation. He wanted to travel from city U to city V. Being quite an explorer, he wanted to travel exactly once by roadways as well as by railway - 题解

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题目信息
题号 P21416
标题 [HackerEarth] Xenny, the traveller, was in AlgoLand for vacation. He wanted to travel from city U to city V. Being quite an explorer, he wanted to travel exactly once by roadways as well as by railway
难度 普及-
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