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Description When YY was a boy and LMY was a girl, they trained for NOI (National Olympiad in Informatics) in GD team. One day, GD team’s coach, Prof. ... 阅读全文
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Description某省调查城镇交通状况，得到现有城镇道路统计表，表中列出了每条道路直接连通的城镇。省政府“畅通工程”的目标是使全省任何两个城镇间都可以实现交通（但不一定有直接的道路相连，只要互相间接通过道路可达即可）。问最少还需要建设多少条道路？Input 测试输入包含若干测试用例。每个测试用例... 阅读全文
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Description 上次Gardon的迷宫城堡小希玩了很久（见Problem B），现在她也想设计一个迷宫让Gardon来走。但是她设计迷宫的思路不一样，首先她认为所有的通道都应该是双向连通的，就是说如果有一个通道连通了房 间A和B，那么既可以通过它从房间A走到房间B，也可以通过它从房间B走到房... 阅读全文
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Description In the age of television, not many people attend theater performances. Antique Comedians of Malidinesia are aware of this fact. They want ... 阅读全文
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Problem Description给你n个点，m条无向边，每条边都有长度d和花费p，给你起点s终点t，要求输出起点到终点的最短距离及其花费，如果最短距离有多条路线，则输出花费最少的。Input输入n,m，点的编号是1~n,然后是m行，每行4个数 a,b,d,p，表示a和b之间有一条边，且其长度为... 阅读全文
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DescriptionEveryone knows how to calculate the shortest path in a directed graph. In fact, the opposite problem is also easy. Given the length of shor... 阅读全文
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DescriptionWhile exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-w... 阅读全文
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Description It has recently been discovered how to run open-source software on the Y-Crate gaming device. A number of enterprising designers have deve... 阅读全文