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>
//#define DEBUG 1106
#define int long long
#define ll long long
#define ld long double
#define pb push_back
#define p_q priority_queue
#define m_p make_pair
#define pii pair<int,int>
#define endl '\n'
#define INIT ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define FOR(i,a,b) for(int i = a; i <= b; i++)
#define forn(i,n) for (int i = 0; i < n; i++)
#define forn1(i,n) for (int i = 1; i <= n; i++)
#define all(x) x.begin(),x.end()
#define ft first
#define sd second
#define lowbit(x) (x&(-x))
#define chmax(x,y) x=max(x,y)
#define chmin(x,y) x=min(x,y)
#ifdef DEBUG
#define debug(x) cout << #x << ": " << x << endl;
#else
#define debug(x) 1106;
#endif
using namespace std;
const int N = 2e5+5;
const int inf = 1e9;
const int INF = 1e18;
const int MOD = 1e9+7;
struct node {
int s, e, m, v;
node *l, *r;
node(int _s, int _e) {
s = _s, e = _e, v = 0;
m = (s+e)/2;
if(s != e) {
l = new node(s, m);
r = new node(m+1, e);
}
}
int query(int a, int b) {
if(a>b) return -inf;
if(a <= s && e <= b) return v;
else if(a > m) return r->query(a, b);
else if(b <= m) return l->query(a, b);
else return max(l->query(a, b), r->query(a, b));
}
void up(int p, int val) {
if(s == e) {
v = val; return;
} else if(p <= m) l->up(p, val);
else r->up(p, val);
v = max(l->v, r->v);
}
} *root;
int a[N];
signed main() {
//INIT
#ifdef DEBUG
freopen("input.txt", "r", stdin);
#endif
///////////
int n;
cin >> n;
root = new node(0,n+1);
forn1(i,n) {
cin >> a[i];
root->up(i,a[i]);
}
int q;
cin >> q;
int l, r;
while(q--) {
cin >> l >> r;
int ans = 0;
for(int i = l; i <= r-1; i++) {
for(int j = i+1; j <= r-1; j++) {
//cout << i << ' ' << j << '|' << j+1 << ' ' << min(r,j+(j-i)) << endl;
int k = root->query(j+(j-i),r);
chmax(ans,a[i]+a[j]+k);
}
}
cout << ans << endl;
}
}
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