func_code_string: #include <bits/stdc++.h>   using namespace std;   map<long long, long long> m;   void solve() {     long long n;     cin >> n;     map<long long, long long>::iterator itr;     long long x, maxm = INT_MIN;     for (long long i = 0; i < n; i++) {       cin >> x;       m[x - (i + 1)] += x;     }     for (auto &it : m) {       maxm = max(maxm, it.second);     }     cout << maxm;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     solve();     return 0;   }   