26 lines
335 B
C++
26 lines
335 B
C++
#include <bits/stdc++.h>
|
|
#define endl '\n'
|
|
using namespace std;
|
|
|
|
int n, m;
|
|
int arr[100100];
|
|
int dp[100100];
|
|
int x, y;
|
|
|
|
int main(){
|
|
cin >> n >> m;
|
|
for(int i = 1; i <= n; i++){
|
|
cin >> arr[i];
|
|
dp[i] = dp[i - 1] + arr[i];
|
|
}
|
|
for(int i = 1; i <= m; i++){
|
|
cin >> x >> y;
|
|
cout << dp[y] - dp[x - 1] << endl;
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
}
|
|
|