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Given an N*N matrix with each entry equal to 0 or 1. You can swap any two rows or any two columns. Can you find a way to make all the diagonal entries 阅读全文
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Judge Bahosain was bored at ACM AmrahCPC 2016 as the winner of the contest had the first rank from the second hour until the end of the contest. Bahos 阅读全文
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小希和Gardon在玩一个游戏：对一个N*M的棋盘，在格子里放尽量多的一些国际象棋里面的“车”，并且使得他们不能互相攻击，这当然很简单，但是Gardon限制了只有某些格子才可以放，小希还是很轻松的解决了这个问题（见下图）注意不能放车的地方不影响车的互相攻击。 所以现在Gardon想让小希来解决一个更 阅读全文
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There are a group of students. Some of them may know each other, while others don't. For example, A and B know each other, B and C know each other. Bu 阅读全文
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onsider a group of N students and P courses. Each student visits zero, one or more than one courses. Your task is to determine whether it is possible 阅读全文
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You are to write a program that has to decide whether a given line segment intersects a given rectangle. An example: line: start point: (4,9) end poin 阅读全文
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Stan has n sticks of various length. He throws them one at a time on the floor in a random way. After finishing throwing, Stan tries to find the top s 阅读全文
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We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no in 阅读全文
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Given n segments in the two dimensional space, write a program, which determines if there exists a line such that after projecting these segments on i 阅读全文
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Mom and dad have a problem: their child, Reza, never puts his toys away when he is finished playing with them. They gave Reza a rectangular box to put 阅读全文