#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, q;
    cin >> n >> q;

    vector<int> a(n);
    for(int &x : a){
        cin >> x;
    }

    while(q--){
        int v, e;
        cin >> v >> e;

        int nyereseg = 0;
        bool birtokol = 0;

        for(int i = 0; i < n; i++){
            if(!birtokol && a[i] <= v){
                nyereseg -= a[i];
                birtokol = 1;
            } else if(birtokol && a[i] >= e){
                nyereseg += a[i];
                birtokol = 0;
            }
        }

        cout << nyereseg << "\n";
    }
}