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//============================================================================
// Name        : Siano.cpp
// Author      : Tytus Bierwiaczonek
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <stdint.h>
using namespace std;

const uint64_t nMax = 500000;

int main()
{
	std::ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	uint64_t n, m, i, j, d, dLast = 0, b;
	uint64_t result = 0;
	uint64_t grassTypes[nMax];
	uint64_t grassHeight[nMax];

	cin >> n >> m;

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

	for (j = 0; j < m; ++j)
	{
		cin >> d >> b;
		for (i = 0; i < n; ++i)
		{
			grassHeight[i] += (d - dLast) * grassTypes[i];
			if (grassHeight[i] > b)
			{
				result += grassHeight[i] - b;
			}
			grassHeight[i] = min(b, grassHeight[i]);
		}

		cout << result << endl;
		result = 0;
		dLast = d;
	}

	return 0;
}