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膜拜众神牛.........本小菜没想到可以倒着插入.......于是直接用平衡二叉树来模拟了....RT............... 扔了个Treap上去........然后维护一个“子节点数”的域，插入时按照这个域进行插入..没想到1A..........膜拜所有用线段树AC的神牛!!!!! Followed by:
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