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#include <cstdio>
#include <cstdlib>
#include <vector>

using namespace std;


int main() {
    int n, m;
    int a;
    int d, b;

    scanf("%d", &n);
    scanf("%d", &m);

    int last_d = 0;

    vector<int> input;
    vector<int> data;

    input.resize(n);
    data.resize(n);

    for (int i = 0; i < n; i++) {
        scanf("%d", &input[i]);
    }

    for (int j = 0; j < m; j++) {
        scanf("%d", &d);
        scanf("%d", &b);

        for (int i = 0 ; i < n; ++i) {
            data[i] += input[i] * (d - last_d);
        }

        int sum = 0;

        for (vector<int>::iterator it = data.begin(); it != data.end(); ++it) {
            if (*it >= b) {
                sum += *it - b;
                *it = b;
            }
        }

        printf("%d\n", sum);

        last_d = d;
    }

}