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#include<stdio.h>
#include<iostream>

int main(){

long long LastDay=0, suma, b, d;
int tab[500002], m, n;
long long ile[500002];
scanf("%d", &n);
scanf("%d", &m);
for(int i=0;i<n;i++){ scanf("%d", &tab[i]); ile[i]=0;}

for(int i=0;i<m;i++){
	suma=0;
	scanf("%lld", &d);
	scanf("%lld", &b);
	
for(int j=0;j<n;j++){
	ile[j]+=(d-LastDay)*tab[j];
	if(ile[j]>b){ 
		suma+=ile[j]-b;
		ile[j]=b;
	}
}
LastDay=d;	
printf("%lld\n", suma);	
	
}

return 0;	
}