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#include <iostream>

using namespace std;

struct grass{
    int growth;
    long long height;

    grass(int g) : growth(g), height(0) {}

    inline void grow(int days){
        height += growth * days;
    }

    inline int trim(int h){
        if(h >= height)
            return 0;
        int diff = height - h;
        height = h;
        return diff;
    }
};

int main(){
    ios_base::sync_with_stdio(0);
    int n, m, a, day, height, deltaDay, lastDay, trimmedMass;
    lastDay = 0;
    cin >> n >> m;
    grass** field = new grass*[n];
    for (int i = 0; i < n; ++i){
        cin >> a;
        field[i] = new grass(a);
    }

    for(int i = 0; i < m; ++i){
        trimmedMass = 0;
        cin >> day >> height;
        deltaDay = day - lastDay;
        lastDay = day;


        for(int j = 0; j < n; ++j){
            field[j]->grow(deltaDay);
            trimmedMass += field[j]->trim(height);
        }

        cout << trimmedMass << endl;
    }
}