题目https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=26&problem=2330&mosmsg=Submission+received+with+ID+1779597题目https://icpcarchive.ecs.baylor.edu/index.php?
阅读背景：
LA-4329 Ping pong - treap （排名树）/树状数组求排名
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