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Problem Description On Octorber 21st, HDU 50-year-celebration, 50-color balloons floating around the campus, it's so nice, isn'... 阅读全文
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Problem Description Bob enjoys playing computer games, especially strategic games, but sometimes he cannot find the solution fa... 阅读全文
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Problem Description Bessie wants to navigate her spaceship through a dangerous asteroid field in the shape of an N x N grid (1 ... 阅读全文
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Problem Description In the second year of the university somebody started a study on the romantic relations between the student... 阅读全文
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Problem Description The zoo have N cats and M dogs, today there are P children visiting the zoo, each child has a like-animal a... 阅读全文
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Problem Description Frank N. Stein is a very conservative high-school teacher. He wants to take some of his students on an excu... 阅读全文
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Problem Description In a kindergarten, there are a lot of kids. All girls of the kids know each other and all boys also know ea... 阅读全文
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并查集、2-SAT、二分图相关内容都看完了，但只做了些并查集、二分图判定、二分图最大匹配的题，其他内容仍需多做些题来验证一下，只剩差分约束和网络流内容没看，考试周快来了，这周先尽量看吧。。 天冷了，这周一天到晚窝在宿舍，基本废了，欠下的东西太多了，今天把东西搬... 阅读全文
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Problem Description Jimmy is studying Advanced Graph Algorithms at his university. His most recent assignment is to find a maxi... 阅读全文
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Problem Description 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... 阅读全文
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Problem Description There are a group of students. Some of them may know each other, while others don't. For example, A and B k... 阅读全文
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Problem Description RPG girls今天和大家一起去游乐场玩，终于可以坐上梦寐以求的过山车了。可是，过山车的每一排只有两个座位，而且还有条不成文的规矩，就是每个女生必须找个个男生做partner和她同坐。但是，每个女孩都有各自的想法... 阅读全文
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Problem Description The gopher family, having averted the canine threat, must face a new predator. The are n gophers and m go... 阅读全文
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Problem Description It is well known that it is not easy to select courses in the college, for there is usually conflict among ... 阅读全文
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Problem Description Farmer John completed his new barn just last week, complete with all the latest milking technology. Unfortu... 阅读全文
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Problem Description Consider a group of N students and P courses. Each student visits zero, one or more than one courses. Your ... 阅读全文
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Problem Description A thief is running away! We can consider the city where he locates as an undirected graph in which nodes st... 阅读全文
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Problem Description Now and then you play the following game with your friend. Your friend writes down a sequence consisting of... 阅读全文
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Problem Description N children are playing Rochambeau (scissors-rock-cloth) game with you. One of them is the judge. The rest c... 阅读全文
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Problem Description 动物王国中有三类动物A,B,C，这三类动物的食物链构成了有趣的环形。A吃B， B吃C，C吃A。 现有N个动物，以1－N编号。每个动物都是A,B,C中的一种，但是我们并不知道它到底是哪一种。 有人用两种说法对这N... 阅读全文