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NC24608 [USACO 2011 Ope S]Learning Languages
题目链接 题目 题目描述 Farmer John's N (2 <= N <= 10,000) cows, conveniently numbered 1..N, are fluent in some M (1 <= M <= 30,000) languages, also conveniently numbered from 1..M. Cow i can speak in KiK_iKi (1 <= \(K_i\) <= M) languages, n