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

int main()
{
    ios_base::sync_with_stdio(false);
    int n, m;
    int a;
    uint64_t b, d, suma;
    vector<uint64_t> ile_urosnie;

    cin >> n; // ile rodzajow trawy
    cin >> m; // ile dni kosil
    for(int i = 0; i < n; i++)
    {
        cin >> a;
        ile_urosnie.push_back(a);
    }
   vector<uint64_t> pole(ile_urosnie);

    //wczytac dane b na dzien
    for(int i = 1; i <= m; i++)
    {
        suma = 0;
        cin >> d;
        cin >> b;
        for(int j = 0; j < n; j++)
        {
            if(pole[j] > b)
            {
                suma = suma + pole[j] - b;
                pole[j] = b;
            }
            pole[j] = pole[j] + ile_urosnie[j];
        }
        cout << suma << "\n";
    }
    return 0;
}