#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;
using ll = long long;
using ld = long double;

#define all(x)  x.begin(),x.end()
#define v(x) vector<x>
#define nl '\n'
#define fxd(x) fixed << setprecision(x)
template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;


int main()
{
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int n , q; cin >> n >> q;
    v(ll) arr(n);
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
    }
    v(ll) freq(n+1,0);
    for (int i = 1; i <= n; i++)
    {
        freq[i] = arr[i-1] + freq[i-1];
    }
    for (int i = 0; i < q; i++)
    {
        ll l , r; cin >> l >> r;
        cout << freq[r] - freq[l] << nl;
    }
    
}