func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 200100;   int main() {     int n = 0, u = 0, v = 0;     int d[MAXN] = {0};     scanf( %d , &n);     for (int i = 0; i < n - 1; i++) {       scanf( %d %d , &u, &v);       d[u] += 1;       d[v] += 1;     }     for (int i = 1; i <= n; i++) {       if (d[i] == 2) {         printf( NO n );         return 0;       }     }     printf( YES n );     return 0;   }   