func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int x = 1, y = 1;     int k = 0;     cin >> k;     bool fl = false;     for (int i = 1; i <= n; i++) {       int t;       if (i != n)         cin >> t;       else         t = 1 - k;       if (t == k && fl == false) {         x++;       } else if (t != k) {         if (y != x && fl == true) {           cout <<  NO ;           return 0;         }         fl = true;         y = 1;         k = t;       } else if (t == k) {         y++;       }     }     cout <<  YES ;   }   