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题目：https://vjudge.net/problem/POJ-3268 One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to 阅读全文
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题目：https://vjudge.net/problem/POJ-3190 Oh those picky N (1 <= N <= 50,000) cows! They are so picky that each one will only be milked over some precise 阅读全文
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题目：https://vjudge.net/problem/POJ-3259 While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very pe 阅读全文
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题目： http://codeforces.com/gym/101630 E A young hero is starting his heroic life. The wise wizard suggested him an easy first quest. During this quest o 阅读全文