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E. Sasha and Array 题目连接： http://codeforces.com/contest/719/problem/E Description Sasha has an array of integers a1, a2, ..., an. You have to perform m 阅读全文
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C. Efim and Strange Grade 题目连接： http://codeforces.com/contest/719/problem/C Description Efim just received his grade for the last test. He studies in 阅读全文
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B. Anatoly and Cockroaches 题目连接： http://codeforces.com/contest/719/problem/B Description Anatoly lives in the university dorm as many other students d 阅读全文
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A. Vitya in the Countryside 题目连接： http://codeforces.com/contest/719/problem/A Description Every summer Vitya comes to visit his grandmother in the cou 阅读全文