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Problem Description Ignatius is so lucky that he met a Martian yesterday. But he didn't know the language the Martians use. The Martian gives him a hi 阅读全文
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Problem Description Mario is world-famous plumber. His “burly” figure and amazing jumping ability reminded in our memory. Now the poor princess is in 阅读全文
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题目描述 一个合法的括号序列是这样定义的: 空串是合法的。 如果字符串 S 是合法的,则(S)也是合法的。 现在给你一个长度为 N 的由‘('和‘)'组成的字符串,位置标号从 1 到 N。对这个字符串有下列四种操作: Replace a b c:将[a,b]之间的所有括号改成 c。例如:假设原来的字 阅读全文