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#include <iostream>
using namespace std;
int n, m, a[500000];
long long int d, b, l, s, r, t[500000];
int main()
{
	ios_base::sync_with_stdio(0);
	cin >> n >> m;
	for (int i = 0; i < n; ++i) 
	{
		cin >> a[i];
	}
	for (int i = 0; i < m; ++i)
	{
		cin >> d >> b;
		s = 0;
		r = d - l;
		l = d;
		for (int j = 0; j < n; ++j)
		{
			t[j] += r * a[j];
			if (t[j] > b) 
			{
				s += t[j] - b;
				t[j] = b;
			}
		}
		cout << s << endl;
	}
	return 0;
}