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#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <vector>

using namespace std;

int main()
{
  long long int n, m, x, d, b, ts, sum, z;
	
	scanf("%lld %lld", &n, &m);
	vector <long long int> v;
	vector <long long int> wys;
	ts=1;
	
	for(int i=0;i<n;i++)
	{
	 scanf("%lld", &x);
	 v.push_back(x);
	 wys.push_back(x);
	}
	
	for(int i=0;i<m;i++)
	{
	 sum=0LL;
	 scanf("%lld %lld", &d, &b);
	 	
	 	for(int j=0;j<v.size();j++)
		{
	 	 z=v[j]+(d-ts)*wys[j];
	 		
	 		if(z>b)
	 			sum=sum+z-b;
	 	
	 	 v[j]=min(z, b);
		}
	 	
	 printf("%lld\n", sum);
	 ts=d;
	}

	return 0;
}