The last!!!

17:15分,Closed Fences终于AC了……
第一次提交就AC了!~
工作了3-4个小时,从下午第一节课开始一直到现在,终于AC了……
复杂度:O(n^2) 应该还可以改进……
累…… 饿死了…… 回家吃饭……

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