func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC target( avx,avx2,fma )   #pragma GCC optimization( unroll-loops )   using namespace std;   int n;   pair<int, int> e[200005];   int deg[200005];   vector<int> Adj[200005];   void solve();   int main() { solve(); }   void solve() {     cin >> n;     for (int i = 1; i <= n - 1; i++) {       int u, v;       cin >> u >> v;       e[i] = {u, v};       Adj[u].push_back(v);       Adj[v].push_back(u);     }     for (int i = 1; i <= n - 1; i++) {       int u = e[i].first, v = e[i].second;       int c = 0, d = 0;       if (Adj[u].size() - 1 == 1) {         cout <<  NO ;         return;       }       if (Adj[v].size() - 1 == 1) {         cout <<  NO ;         return;       }     }     cout <<  YES ;   }   