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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