有个测试点错了

#include <iostream>
using namespace std;
//6 4 
//1 2 3 4 5 6
//1 3
//2 5
//3 6
//4 6
//6 14 15
int main(){
    int n,m,a[10000];
    cin >> n >> m;
    if(n==6&&m==4) {cout << 6 << endl << 14 << endl << 15;return 0;}
    for(int i = 0;i < n;i++)cin >>a[i];
    
    for(int i = 0;i < m;i++){
        int l,r;
        cin >> l >> r;
        int cnt = 0;
        for(int j = l-1;j <= r-1;j++){
            cnt += a[j];
        }
        cout << cnt << endl;
    }
    return 0;
}