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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    uint64_t day, nextDay, b, w;
    uint32_t n, m;
    ios_base::sync_with_stdio(0);
    cin>>n;
    cin>>m;
    vector<uint32_t> a(n);
    vector<uint32_t> h(n);
    for(uint32_t i = 0; i < n; ++i)
    {
        cin>>a[i];
    }
    nextDay = 0;
    for(uint32_t i = 0; i < m; ++i)
    {
        w = 0;
        day = nextDay;
        cin>>nextDay;
        cin>>b;
        for(uint32_t j = 0; j < n; ++j)
        {
            h[j] += a[j] * (nextDay - day);
            if(h[j] > b)
            {
                w += h[j] - b;
                h[j] = b;
            }
        }
        cout<<w<<endl;
    }



    return 0;
}