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#include<stdio.h>
#include<limits.h>
#include<stdlib.h>

int main(void)
{
  unsigned long n,m,i,j;
  unsigned long *a;
  
  unsigned long long *l;
  unsigned long long d,b,t,s,dx;
  scanf("%lu %lu", &n,&m);
  a=malloc(4*n);
  l=malloc(8*n);
  for(i=0;i<n;i++)
    scanf("%lu", &(a[i]));
  t=0;
  for(i=0;i<m;i++){
    s = 0;
    scanf("%llu %llu",&d,&b);
    for(j=0;j<n;j++){
      dx = l[j]+a[j]*(d-t);
      if(dx>b){
	s += dx - b;
	l[j] = b;
      } else {
	l[j] = dx;
      }
    }
    printf("%lu\n",s);
    t = d;
  }
  return 0;
}