func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int i, n, moves = 0, flag = 1, gears;     cin >> n;     cin >> gears;     moves = n - gears;     for (i = 1; i < n; i++) {       cin >> gears;       if (i % 2 == 1)         gears = (gears + (n - moves)) % n;       else         gears = (gears + moves) % n;       if (gears != i) {         cout <<  No  << endl;         return 0;       }     }     cout <<  Yes  << endl;     return 0;   }   