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#include <cstdio>

int main()
{
    long long n, m, d, b, oldD, sum, mnoznik;
    d = 0;
    oldD = 0;
    scanf("%lld", &n);
    scanf("%lld", &m);
    long long *A = new long long[n];
    long long *SUM = new long long[n];

    for(long long i = 0; i < n; i++)
    {
        scanf("%lld", A + i);
        SUM[i] = 0;
    }

    while(m--)
    {
        sum = 0;
        oldD = d;
        scanf("%lld", &d);
        scanf("%lld", &b);
        mnoznik = d - oldD;
        for(int i = 0; i < n; i++)
        {
            SUM[i] += mnoznik * A[i];
            if(SUM[i] > b)
            {
                sum += SUM[i] - b;
                SUM[i] = b;
            }
        }
        printf("%lld\n", sum);
    }

}