树状数组
题单介绍
树状数组+线段树
求逆序对可以用树状数组或者归并排序的方法
- [P3374 【模板】树状数组 1](https://www.luogu.com.cn/problem/P3374)
- [P3368 【模板】树状数组 2](https://www.luogu.com.cn/problem/P3368)
- [P2068 统计和](https://www.luogu.com.cn/problem/P2068)
- [P1908 逆序对](https://www.luogu.com.cn/problem/P1908)
- [P1966 [NOIP 2013 提高组] 火柴排队](https://www.luogu.com.cn/problem/P1966)
- [P2345 [USACO04OPEN] MooFest G](https://www.luogu.com.cn/problem/P2345)
- [P1438 无聊的数列](https://www.luogu.com.cn/problem/P1438)
- [P2344 [USACO11FEB] Generic Cow Protests G](https://www.luogu.com.cn/problem/P2344)
- [P5057 [CQOI2006] 简单题](https://www.luogu.com.cn/problem/P5057)