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D. Bear and Tower of Cubes 题目连接： http://www.codeforces.com/contest/680/problem/D Description Limak is a little polar bear. He plays by building towers 阅读全文
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C. Bear and Prime 100 题目连接： http://www.codeforces.com/contest/680/problem/C Description This is an interactive problem. In the output section below yo 阅读全文
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B. Bear and Finding Criminals 题目连接： http://www.codeforces.com/contest/680/problem/B Description There are n cities in Bearland, numbered 1 through n. 阅读全文
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A. Bear and Five Cards 题目连接： http://www.codeforces.com/contest/680/problem/A Description A little bear Limak plays a game. He has five cards. There is 阅读全文