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#include <iostream>
#include <vector>
using namespace std;

int main() {
	int ars, cuts;
	cin >> ars >> cuts;
	vector <int>field(ars,0);
	int grows[ars];
	for(int i =0; i< ars; ++i)
	{
		cin >> grows[i];
	}
	int day, cut, sum =0, lastDay =0;
	for(int i=0;i<cuts;++i)
	{
		sum =0;
		cin >> day >> cut;
		int days  = (day - lastDay);
		for(int j=0;j<ars;++j)
		{
			int t = days*grows[j]+field[j];
			// cout << "t: " << t  << "grows[i]: " << grows[i] << endl;
			if(t>cut)
			{
				sum += (t-cut);
				field[j]=cut;
			}
			else 
				field[j]=t;
			lastDay = day;
		}
		// for(auto &j : field) cout << j << " ";
		cout << sum << endl;
	}
	return 0;
}