#include <bits/stdc++.h>
using namespace std;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int n, q;
    if (!(cin >> n >> q)) return 0;

    vector<long long> dp(n + 1, 0);
    for (int i = 1; i <= n; ++i) {
        cin >> dp[i];
        dp[i] += dp[i - 1];
    }

    while (q--) {
        int l, r;
        cin >> l >> r;
        cout << dp[r] - dp[l - 1] << "\n";
    }
    return 0;
}