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Maximum Xor Secondary CodeForces - 280B Bike loves looking for the second maximum element in the sequence. The second maximum element in the sequence 阅读全文
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Average distance HDU - 2376 Given a tree, calculate the average distance between two vertices in the tree. For example, the average distance between t 阅读全文
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Balls and Boxes CodeForces - 260C Little Vasya had n boxes with balls in the room. The boxes stood in a row and were numbered with numbers from 1 to n 阅读全文
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Almost Arithmetical Progression CodeForces - 255C Gena loves sequences of numbers. Recently, he has discovered a new type of sequences which he called 阅读全文
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Anniversary party HDU - 1520 There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierar 阅读全文
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Reachability from the Capital CodeForces - 999E There are nn cities and mm roads in Berland. Each road connects a pair of cities. The roads in Berland 阅读全文
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Bear and Colors CodeForces - 673C Bear Limak has n colored balls, arranged in one long row. Balls are numbered 1through n, from left to right. There a 阅读全文
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Plants vs. Zombies ZOJ - 4062 BaoBao and DreamGrid are playing the game Plants vs. Zombies. In the game, DreamGrid grows plants to defend his garden a 阅读全文
