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D. Palindrome Degree 题目连接： http://www.codeforces.com/contest/7/problem/D Description String s of length n is called k palindrome, if it is a palindrom 阅读全文
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C. Line 题目连接： http://www.codeforces.com/contest/7/problem/C Description A line on the plane is described by an equation Ax + By + C = 0. You are to fi 阅读全文
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B. Memory Manager 题目连接： http://www.codeforces.com/contest/7/problem/B Description There is little time left before the release of the first national o 阅读全文
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A. Kalevitch and Chess 题目连接： http://www.codeforces.com/contest/7/problem/A Description A famous Berland's painter Kalevitch likes to shock the public. 阅读全文