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#ifdef _MSC_VER
  #ifndef __GNUC__
    #pragma warning(disable: 4996)
  #endif
  #define main main0
#endif
#include <iostream>
using namespace std;

static const int Max = 500000;
long long speed[Max];
long long height[Max];

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  int n, m;
  long long previous, current, trimming, result = 0;

  cin >> n >> m;
  for(int i = 0; i < n; ++i)
    cin >> speed[i];

  cin >> current >> trimming;
  previous = current;
  for(int j = 0; j < n; ++j) {
    height[j] = speed[j] * previous;
    if(height[j] > trimming) {
      result += height[j] - trimming;
      height[j] = trimming;
    }
  }
  cout << result << '\n';
  
  for(int i = 1; i < m; ++i) {/*/
  for(int i = 0; i < m; ++i) {//*/
    result = 0;
    cin >> current >> trimming;
    previous = current - previous;
    for(int j = 0; j < n; ++j) {
      height[j] += speed[j] * previous;
      if(height[j] > trimming) {
        result += height[j] - trimming;
        height[j] = trimming;
      }
    }
    previous = current;
    cout << result << '\n';
  }
  cout.flush();

  return 0;
}