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#include <iostream>

using namespace std;
const int SIZE = 5000000;

long long tab[SIZE];
long long wzrost[SIZE];

int main() {
    ios_base::sync_with_stdio(false);

    int n, m;
    cin >> n >> m;

    for(int i=0; i<n; ++i)
        cin >> wzrost[i];

    long long a, b, prev=0, out=0;
    while(m--) {
        long long out = 0;
        cin >> a >> b;
        for(int i=0; i<n; ++i) {
            tab[i] += wzrost[i] * (a - prev);
            if(tab[i] > b) {
                out += tab[i] - b;
                tab[i] = b;
            }
        }
        prev = a;
        cout << out << endl;
    }

    return 0;
}