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#include <iostream>

using namespace std;
int n, m;
const int stala = 500000;
long long int szyb[stala], wys[stala], d[stala], b[stala];
long long int suma, roz;

int main() {
    ios_base::sync_with_stdio(0);
    cin >> n >> m;

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

    for(int i = 1; i <= m; i++) {
        cin >> d[i] >> b[i];
    }

    for(int i = 1; i <= m; i++) {
        roz = d[i]-d[i-1];
        suma = 0;
        for(int j = 0; j < n; j++) {
            wys[j] += szyb[j]*roz;
            if(wys[j] > b[i]) {
                suma += wys[j]-b[i];
                wys[j] = b[i];
            }
        }
        cout << suma << "\n";
    }

    return 0;
}