#include <bits/stdc++.h>
using namespace std;
int solution(vector<int> values) {
if(values.size() == 1) return 0;
int maxv = 0 , res = 0;
for(int i = 0 ; i < values.size() ; i ++)
{
res = max(res , values[i] - i + maxv);
maxv = max(maxv , values[i] + i);
}
return res; // Placeholder return
}
int main() {
cout << (solution({8, 3, 5, 5, 6}) == 11) << endl;
cout << (solution({10, 4, 8, 7}) == 16) << endl;
cout << (solution({1, 2, 3, 4, 5}) == 8) << endl;
return 0;
}