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我是砂紫

Posted by 947186602 at 2020-08-02 17:18:41 on Problem 2566 and last updated at 2020-08-02 17:19:22 
排序前缀和和，以为sum[0]= 0后面没用，没放入排序
结果所有从1开始的区间全部 木大···
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