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#include <stdio.h>
#include <string.h>

int main()
{
    int n = 0;
    int m = 0;
    int * grass =  new int[n];
    int * a =  new int[n];
    int lastTime = 0;

    scanf("%d", &n);
    scanf("%d", &m);

    int nn = n;
    int mm = m;
    for (int i=0;i<nn;i++)
    {
        int aa;
        scanf("%d", &aa);
        a[i] = aa;
        grass[i] == aa;
    }

    int ii = 0;
    for (int i=0; ii<mm; ii++)
    {
        int time;
        int b;
        scanf("%d", &time);
        scanf("%d", &b);


        for (int j=0;j<nn;j++)
        {
            grass[j]+= a[j]*(time-lastTime);
        }


        int cut = 0;

        for (int j=0;j<nn;j++)
        {
            if (grass[j] > b)
            {
                cut += (grass[j] - b);
                grass[j]=b;
            }
        }

        printf("%d\n" , cut);
        lastTime = time;
    }
    delete[] grass;
    delete[] a;
}