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#include <stdio.h>

int a[1000000];
int wys[1000000];

int main()
{
	int n, m;

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

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

		long long siano = 0;
		for (int j = 0; j < n; j++) {
			wys[j] = wys[j] + a[j]*(d - day);
			if (wys[j] > b) {
				siano += wys[j] - b;
				wys[j] = b;
			}
		}

		printf("%lld\n", siano);

		day = d;
	}

	return 0;
}