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题目来源:http://codeforces.com/problemset/problem/266/B During the break the schoolchildren, boys and girls, formed a queue of n people in the canteen. In 阅读全文
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题目来源:http://codeforces.com/problemset/problem/116/A Linear Kingdom has exactly one tram line. It has n stops, numbered from 1 to n in the order of tra 阅读全文
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题目来源: http://codeforces.com/problemset/problem/122/A Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal 阅读全文