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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define MAXN 500000
using namespace std;
typedef unsigned long long ull;

int A[MAXN];
ull B[MAXN];

int main() {
	int n, m, i;
	ull a, d, al;
	ull wynik;
	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++) {
		scanf("%d", &A[i]);
		B[i] = 0;
	}
	al = 0;
	while (m--) {
		wynik = 0;
		scanf("%llu%llu", &a, &d);
		for (i = 0; i < n; i++) {
			B[i] += (A[i] * (a- al));
			if (B[i] > d) {
				wynik += (B[i] - d);
				B[i] = d;
			}
		}
		al = a;
		printf("%llu\n", wynik);
	}
	return 0;
}