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#include <stdio.h>
using namespace std;

int main()
{
	int n, m;
	scanf("%d %d", & n, & m );

	int ** squares = new int * [n];

	for (int i = 0; i < n; i++)
	{
		squares[i] = new int[2];
		scanf("%d", & squares[i][0]);
	}

	int ** cutting = new int * [m];
	int lday = 0;

	for (int i = 0; i < m; i++)
	{
		cutting[i] = new int[2];

		int day = 0;
		int centimeters = 0;

		scanf("%d %d", & day, & centimeters);
		int days_passed = day - lday;
		lday = day;

		cutting[i][0] = days_passed;
		cutting[i][1] = centimeters;
	}


	for (int i = 0; i < m; i++)
	{
		int all_cut = 0;
		int days_passed = cutting[i][0];
		int centimeters = cutting[i][1];

		for (int j = 0; j < n; j++)
		{
			squares[j][1] += days_passed * squares[j][0];
			if (centimeters < squares[j][1])
			{
				all_cut += squares[j][1] - centimeters;
				squares[j][1] = centimeters;
			}
		}
		printf("%d\n", all_cut);
	}


	return 0;
}