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E. Thief in a Shop A thief made his way to a shop. As usual he has his lucky knapsack with him. The knapsack can contain k objects. There are n kinds 阅读全文
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#1388 : Periodic Signal 描述 Profess X is an expert in signal processing. He has a device which can send a particular 1 second signal repeatedly. The si 阅读全文
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Triple Sums You're given a sequence s of N distinct integers.Consider all the possible sums of three integers from the sequence at three different ind 阅读全文
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题目链接：点这里 题意: 给你一个矩阵R*C，n个点，与给的的n个点同一列同一行，同一条主对角线上的点都被染黑 问你最后有多少个点没有被染黑 题解： 把每一列每一行没有被染黑的x,y找出来，其任意组合起来是没这种情况下的答案（同一条主对角线上的点都被染黑） 对于 x - y，我们可以拿来判断两个点是 阅读全文
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A * B Problem Plus Problem Description Calculate A * B. Input Each line will contain two integers A and B. Process to end of file.Note: the length of 阅读全文
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3-idiots Problem Description King OMeGa catched three men who had been streaking in the street. Looking as idiots though, the three men insisted that 阅读全文
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时间限制:20000ms 单点时限:1000ms 内存限制:256MB 描述 在写代码时，我们经常要用到类似 x × a 这样的语句( a 是常数)。众所周知，计算机进行乘法运算是非常慢的，所以我们需要用一些加法、减法和左移的组合来实现乘一个常数这个操作。具体来讲， 我们要把 x × a 替换成：( 阅读全文
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E. Okabe and El Psy Kongroo Okabe likes to take walks but knows that spies from the Organization could be anywhere; that's why he wants to know how ma 阅读全文