AcWing 795. 前缀和

 1 #include <iostream>
 2 #include <vector>
 3 
 4 using namespace std;
 5 
 6 int s;int e;
 7 int n,m;
 8 const int N = 100100; 
 9 vector<int> v(N,0);
10 vector<int> preSum(N,0);
11 vector<pair<int,int>> vp;
12 int main()
13 {
14     cin >> n >> m;
15 
16     for(int i =1;i <= n;i++){
17         cin >> v[i];
18         preSum[i] = preSum[i-1]+v[i];
19     }
20 
21     while(m--){
22         cin >>s >> e;
23         cout << preSum[e] -  preSum[s-1]  << endl;
24     }
25 
26 
27     return 0;
28 }
29 
30 作者：defddr
31 链接：https://www.acwing.com/solution/AcWing/content/2075/
32 来源：AcWing
33 著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。