#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long
int n, q;
vector<pair<int,int> > qu;
int sp[30][10000];
int ans[5005][5005];
int get(int l, int r){
int bt = __lg(r-l);
return max(sp[bt][l], sp[bt][r-(1<<bt)+1]);
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n;
cin >> n;
for(int i = 1; i <= n; i++){
int x;
cin >> x;
sp[0][i] = x;
}
cin >> q;
for(int i = 0; i < q; i++){
int l, r;
cin >> l >> r;
qu.pb({l, r});
}
for(int i = 1; i < 22; i++){
int len = (1 << (i-1));
for(int j = 1; j <= n; j++){
sp[i][j] = max(sp[i-1][j], sp[i-1][min(n,j+len)]);
}
}
for(int i = 0; i <= n; i++){
for(int j = 0; j <= n; j++){
ans[i][j] = 0;
}
}
for(int i = 1; i <= n; i++){
for(int j = i+2; j <= n; j++){
int mid = i + ((j-i) >> 1);
ans[i][j] = sp[0][i] + sp[0][j] + get(i+1, mid);
ans[i][j] = max(ans[i][j], ans[i][j-1]);
}
}
for(int j = n; j > 0; j--){
for(int i = j-1; i > 0; i--){
ans[i][j] = max(ans[i][j], ans[i+1][j]);
}
}
for(auto [l, r] : qu)cout << ans[l][r] << '\n';
}
Compilation message
cc1plus: error: '::main' must return 'int'
jumps.cpp: In function 'int main()':
jumps.cpp:61:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
61 | for(auto [l, r] : qu)cout << ans[l][r] << '\n';
| ^
