#include<bits/stdc++.h>
using namespace std;
#ifndef BADGNU
#pragma GCC target("sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#endif
#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ll long long
#define int ll
#define ld long double
#define y1 cheza
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
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>;
const int N=5e5+100;
const int M=5001;
const int B=447;
const int mod=998244353;
const ll INF=1e18;
const int dx[]={1,-1,0,0};
const int dy[]={0,0,1,-1};
const double eps=1e-6;
int n,q;
int a[N];
int sp[N][19];
int lg[N];
void build(){
lg[1]=0;
for(int i=2;i<=n;i++){
lg[i]=(lg[i/2]+1);
}
for(int i=1;i<=n;i++){
sp[i][0]=a[i];
}
for(int j=1;j<=lg[n];j++){
for(int i=1;i+(1ll<<j)-1<=n;i++){
sp[i][j]=max(sp[i][j-1],sp[i+(1ll<<(j-1))][j-1]);
}
}
}
int get(int l,int r){
int k=lg[r-l+1];
return max(sp[l][k],sp[r-(1<<k)+1][k]);
}
void test(){
cin>>n;
for(int i=1;i<=n;i++){
cin>>a[i];
}
build();
// a<b<c
// b-a<=c-b
// b*2-c<=a
// 2*b-a<=c
// 2*b<=c+a
cin>>q;
for(int l,r;q--;){
cin>>l>>r;
// if(r-l+1<=2){
// cout<<0<<'\n';
// continue;
// }
vector<pair<int,int>>v;
for(int i=l;i<=r;i++){
v.push_back({a[i],i});
}
sort(v.begin(),v.end());
reverse(v.begin(),v.end());
if(v.size()>1000){
v.resize(1000);
}
int ans=0;
for(auto i:v){
for(auto j:v){
if(i.second+2<=j.second){
ans=max(ans,get(i.second+1,(i.second+j.second)/2)+i.first+j.first);
}
if(j.second+2<=i.second){
ans=max(ans,get(j.second+1,(i.second+j.second)/2)+i.first+j.first);
}
}
}
cout<<ans<<'\n';
}
}
/*
*/
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
// cout.tie(nullptr);
int t2=1;
// cin>>t2;
for(int i=1;i<=t2;i++){
test();
}
}
