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Necklace/center 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5727 Description SJX has 2 N magic gems. N of them have Yin energy inside while others 阅读全文
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tetrahedron/center 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5726 Description Given four points ABCD, if ABCD is a tetrahedron, calculate the in 阅读全文
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GCD/center 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5726 Description Give you a sequence of N(N≤100,000) integers : a1,...,an(0 define rep(a,b, 阅读全文
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Abandoned country 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5723 Description An abandoned country has n(n≤100000) villages which are numbered fr 阅读全文