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#include <iostream>
#include <vector>

using namespace std;

int main()
{
  ios::sync_with_stdio(false);
  int n, m;
  cin >> n >> m;

  vector<int> p(n);
  vector<long long> w(n);

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

  long long pd = 0, d, b, r, c, s;
  for (int i = 0; i < m; ++i)
  {
    cin >> d >> b;
    r = d - pd;
    pd = d;
    s = 0;
    for (int j = 0; j < n; ++j)
    {
      w[j] += p[j] * r;
      c = w[j] - b;
      if (c > 0)
      {
        w[j] = b;
        s += c;
      }
    }
    cout << s << "\n";
  }
  return 0;
}