func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     map<int, vector<int> > m;     int e;     for (int i = 2; i <= n; i++) {       cin >> e;       m[e].push_back(i);     }     vector<bool> leaf(n + 1, true);     leaf[1] = false;     for (int i = 1; i <= n; i++) {       if (m.count(i) > 0) {         int c = 0;         for (auto it = m[i].begin(); it != m[i].end(); it++) {           if (m.count(*it) != 1) c++;         }         if (c < 3) {           cout <<  No n ;           return 0;         }       }     }     cout <<  Yes n ;   }   