func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie();     int N, ans = 0;     string s;     cin >> N >> s;     for (int i = 0, j; i < N;) {       if (s[i] ==  ? ) {         for (j = i; j < N && s[j] ==  ? ; j++)           ;         if (j - i > 1 || !i || j == N || s[i - 1] == s[j]) ans = 1;         i = j;       } else {         if (i && s[i - 1] == s[i]) {           cout <<  No n ;           return 0;         }         i++;       }     }     if (ans)       cout <<  Yes n ;     else       cout <<  No n ;     return 0;   }   