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括号匹配 + 离散化也能做到32MS

Posted by applepi at 2010-10-08 21:23:51 on Problem 1177 
先排序，然后分段，用括号匹配的方式做，免去写线段树的麻烦
长沙一中的曹利国先生讲的东西还真不错
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