func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int a[n];     for (int i = 0; i < n; i++) cin >> a[i];     int p = n - a[0];     for (int i = 1; i < n; i++) {       if (i & 1) {         a[i] -= p;         a[i] += (n * 1000000);         a[i] = a[i] % n;         if (a[i] != i) {           cout <<  No ;           return 0;         }       } else {         a[i] += p;         a[i] %= n;         if (a[i] != i) {           cout <<  No ;           return 0;         }       }     }     cout <<  Yes ;     return 0;   }   