#include <bits/stdc++.h>
using namespace std;
const int MAXA = 501;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, q;
    cin >> n >> q;

    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }

    vector<vector<int>> ans(MAXA + 1, vector<int>(MAXA + 1, 0));

    for (int v = 1; v < MAXA; ++v) {
        int e_min = MAXA;
        for (int x : a) {
            if (x <= v) {
                ans[v][v + 1] -= x;
                ans[v][e_min] += x;
                e_min = v + 1;
            } else if (x >= e_min) {
                ans[v][e_min] += x;
                ans[v][x + 1] -= x;
                e_min = x + 1;
            }
        }
        for (int e = v + 1; e < MAXA; ++e) {
            ans[v][e] += ans[v][e - 1];
        }
    }

    for (int i = 0; i < q; ++i) {
        int v, e;
        cin >> v >> e;
        cout << ans[v][e] << "\n";
    }

    return 0;
}