摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1798 Problem Description There are two circles in the plane (shown in the below picture), there is a common 阅读全文
摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1159 Problem Description A subsequence of a given sequence is the given sequence with some elements (possibl 阅读全文
摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1087 Problem Description Nowadays, a kind of chess game called “Super Jumping! Jumping! Jumping!” is very po 阅读全文
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http://acm.hdu.edu.cn/showproblem.php?pid=2139 Problem Description You just need to calculate the sum of the formula: 1^2+3^2+5^2+……+ n ^2. Input In e 阅读全文