#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long
using i64 = long long;
template <class F, class _S>
bool chmin(F &u, const _S &v){
bool flag = false;
if ( u > v ){
u = v; flag |= true;
}
return flag;
}
template <class F, class _S>
bool chmax(F &u, const _S &v){
bool flag = false;
if ( u < v ){
u = v; flag |= true;
}
return flag;
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n; cin >> n;
vector <int> a(n + 1);
for ( int i = 1; i <= n; i++ ){
cin >> a[i];
}
vector <vector<int>> dp(n + 2, vector <int> (n + 2));
for ( int i = n - 2; i > 0; i-- ){
int k = i + 1, mx = 0;
for ( int j = i + 2; j <= n; j++ ){
dp[i][j] = max(dp[i + 1][j], dp[i][j - 1]);
while ( k < j && k - i <= j - k ){
chmax(mx, a[k]);
k++;
}
chmax(dp[i][j], mx + a[i] + a[j]);
}
}
int q; cin >> q;
while ( q-- ){
int l, r; cin >> l >> r;
cout << dp[l][r] << ln;
}
cout << '\n';
}
