线段树套平衡树
#704
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时间复杂度那个地方,应该是2操作要用二分,所以复杂度log^3n吧qwq |
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操作2应该可以取出log个平衡树的根节点一起二分,复杂度两个log |
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https://oi-wiki.org/ds/balanced-in-seg/
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