This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
#define F first
#define S second
const ll ool=1e18;
const int ooi=1e9;
const int MOD=1e9+7;
const int N=5e5;
int n,m;
int a[N+5],x[N+5];
void subtask1(int l,int r) // O(n*n)
{
ll ans=0;
for (int i=1;i<=n;i++) x[i]=0;
for (int i=r;i>=l;i--) x[i]=max(x[i+1],a[i]);
for (int i=l;i<r-1;i++)
for (int j=i+1;j<r;j++)
ans=max(ans,1LL*x[j-i+j]+a[i]+a[j]);
cout<<ans<<endl;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin>>n;
for (int i=1;i<=n;i++) cin>>a[i];
cin>>m;
for (int i=1;i<=m;i++)
{
int l,r; cin>>l>>r;
subtask1(l,r);
}
}
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