南昌网络赛C.Angry FFF Party

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南昌网络赛C.Angry FFF Party Describe In ACM labs, there are only few members who have girlfriends. And these people can make FFF Party angry easily. One day, FFF Party prepared a function \(F\)and a set \(S\). \[ \left\{ \begin{aligned} 1,&&n = 1,2 \\…

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2019南昌网络赛I:Yukino With Subinterval(CDQ) （树状数组套主席树）

题意:询问区间有多少个连续的段,而且这段的颜色在[L,R]才算贡献,每段贡献是1. 有单点修改和区间查询. 思路:46min交了第一发树套树,T了. 稍加优化多交几次就过了. 不难想到,除了L这个点,其他的点都可以只统计这一段的段首.把位置看成x,颜色看成y,就成了二维平面就矩形内点的个数,这就是裸的树套树或者CDQ了. 树套树:34**ms. /* 2019南昌网络赛I. 询问区间有多少个连续的段,而且这段的颜色在[L,R]才算贡献,每段贡献是1. 有单点修改和区间查询. 也可以CDQ来做,常…

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