Yixght is a manager of the company called SzqNetwork(SN). Now she's very worried because she has just received a bad news which denotes that DxtNetwork(DN), the SN's business rival, intents to attack the network of SN. More unfortunately, the origina
因为题中的操作是区间加法,所以满足前缀相减性. 而每一次查询的时候还是单点查询,所以直接用可持久化线段树维护差分数组,然后查一个前缀和就行了. code: #include <bits/stdc++.h> #define N 200004 #define LL long long #define setIO(s) freopen(s".in","r",stdin) using namespace std; int n,m,q,tot,rt[N]; LL