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#include <iostream>
using namespace std;
int main()
{
    long ar,days;
    cin >> ar >> days;
    long day[days];
    long grow[ar];
    long level[days];
    long temp=0;
    long sum=0;
    long grass[ar];
    for (long i=0;i!=ar;i++)
    {
        grass[i]=0;
    }
    for (long i=0;i!=ar;i++)
    {
        cin >> grow[i];
    }
for (long i=0;i!=days;i++)
{
    cin >> day[i] >> level[i];
}
for (long i=0;i!=days;i++)
{
    for (long a=0; a!=ar;a++)
    {
        grass[a]+=(day[i]-temp)*grow[a];
    }
    temp=day[i];
    for (long a=0; a!=ar;a++)
    {
        if (grass[a]>=level[i])
        {
            sum+=grass[a]-level[i];
            grass[a]=level[i];
        }
    }
    cout << sum << endl;
    sum=0;
}
        return 0;
}