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注意 (a,b)的情况

Posted by threedonkey at 2012-03-08 10:02:44 on Problem 3225
如:(2,2)  映射到线段树中是 [11,8] 这个是侯要特判一下
还有 注意将一个区间整体赋值时, xor标记要清零啊

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