Envío 525

Código

#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n, i1, i2, sumarr = 0;

    cin >> n;
    
    vector<int> a(n);

    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        sumarr += a[i];
        a[i] = sumarr;
    }

    cin >> n;
    for (int i = 0; i < n; i++)
    {
        cin >> i1 >> i2;
        if (i1 > 0)
            cout << a[i2] - a[i1 - 1] << endl;
        else
            cout << a[i2] << endl;
    }

    return (0);
}