Diaria.cpp

#include<bits/stdc++.h>
using namespace std;

int n, q, sk;
long long d[110000], p[110000];

int main() {
    cin >> n;
    sk = 0;
    for(int i = 1; i <= n; i++) {
        int k,p;
        cin >> k >> p;
        for(int j = sk+1; j <= sk+k; j++) {
            d[j] = p;
        }
        sk+= k;
    }

    p[0] = 0;
    for(int i = 1; i <= sk; i++) {
        p[i] = p[i-1]+d[i];
    }

    cin >> q;
    for(int i = 1; i <= q; i++) {
        int x,y;
        cin >> x >> y;
        cout << p[y]-p[x-1] << endl;
    }
}