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POJ 3613/P2886 [USACO07NOV]牛继电器Cow Relays
题目描述 For their physical fitness program, N (2 ≤ N ≤ 1,000,000) cows have decided to run a relay race using the T (2 ≤ T ≤ 100) cow trails throughout the pasture. Each trail connects two different in
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