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Problem DescriptionOO has got a array A of size n ,defined a function f(l,r) represent the number of i (li) satisfy ai mod aj=0,now OO want to know∑i=... 阅读全文
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Problem DescriptionMZL loves xor very much.Now he gets an array A.The length of A is n.He wants to know the xor of all (Ai+Aj)(1≤i,j≤n)The xor of an a... 阅读全文
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Problem DescriptionFor 2 non-negative integers x and y, f(x, y) is defined as the number of different bits in the binary format of x and y. For exampl... 阅读全文
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Problem DescriptionToday is the 1st anniversary of BestCoder. Soda, the contest manager, gets a string s of length n. He wants to find three nonoverla... 阅读全文
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Problem DescriptionToday, Soda has learned a sequence whose n-th (n≥1) item is 3n(n−1)+1. Now he wants to know if an integer m can be represented as t... 阅读全文
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Problem DescriptionRecently, Dave is boring, so he often walks around. He finds that some places are too crowded, for example, the ground. He couldn't... 阅读全文
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DescriptionDao was a simple two-player board game designed by Jeff Pickering and Ben van Buskirk at 1999. A variation of it, called S-Dao, is a one-pl... 阅读全文