[HackerEarth] Hackerland is a big country with n cities and some roads. The cities are numbered from 1 to n. The city numbered 1 is the capital city. The people of Hackerland are very smart. They figu - 题解

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题号 P18578
标题 [HackerEarth] Hackerland is a big country with n cities and some roads. The cities are numbered from 1 to n. The city numbered 1 is the capital city. The people of Hackerland are very smart. They figu
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