func_code_string: #include <bits/stdc++.h>   using namespace std;   constexpr long long INF = 2e18;   constexpr long long MOD = 1e9 + 7;   constexpr long long MAXN = 2e5 + 3;   void solve() {     long long n;     cin >> n;     map<long long, long long> m;     long long ans = 0;     for (long long i = 1; i <= n; ++i) {       long long x;       cin >> x;       m[x - i] += x;       ans = max(ans, m[x - i]);     }     cout << ans <<   n ;   }   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long t = 1;     while (t--) solve();   }   