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链接:http://codeforces.com/gym/101116 学弟做的,以后再补 阅读全文
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Description X is fighting beasts in the forest, in order to have a better chance to survive he's gonna buy upgrades for his weapon. Weapon upgrade sho 阅读全文
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Description It is raining again! Youssef really forgot that there is a chance of rain in March, so he didn't fix the roof of his house. Youssef's roof 阅读全文