Codeforces 374D Inna and Sequence 二分+树状数组
题目链接:点击打开链接给定n个操作,m长的序列a下面n个数if(co>=0)则向字符串添加一个co (开始是空字符串)else 删除字符串中有a的下标的字符直接在序列上搞,简单模拟#include#include#include#include#include#include#include#include#include#includeusing na