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/*
 * main.cpp
 *
 *  Created on: Sep 29, 2015
 *      Author: jakub
 */

#include <iostream>
#include <cstdlib>
#include <vector>
#define ULL unsigned long long

using namespace std;

int main() {
	ios_base::sync_with_stdio(false);

	int m, n;
	vector<uint> A;
	vector<ULL> R;

	cin >> n >> m;
	for (int i = 0; i < n; i++) {
		int x;
		cin >> x;
		A.push_back(x);
		R.push_back(0);
	}

	uint last = 0;
	while (m--) {
		ULL d, b, s = 0;
		cin >> d >> b;
		for (int i = 0; i < n; i++) {
			R[i] += (d - last) * A[i];
			if (R[i] > b) {
				s += R[i] - b;
				R[i] = b;
			}
		}
		last = d;
		cout << s << endl;
	}

	return EXIT_SUCCESS;
}