func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MX = 305;   vector<int> adj[MX];   vector<int> l, ans;   int dfs(int u, int v, vector<int>& p, int par = 0) {     int sum = 0;     for (int w : adj[u]) {       if (w != par) {         p.push_back(w);         sum = max(sum, dfs(w, v, p, u));         p.pop_back();       }     }     if (u == v) {       for (int i : p) ans.push_back(i);       return p.size();     }     return sum;   }   int main() {     int n, k = 0;     cin >> n;     for (int i = 1; i < n; i++) {       int u, v;       cin >> u >> v;       adj[u].push_back(v);       adj[v].push_back(u);     }     for (int i = 2; i <= n; i++)       if (adj[i].size() == 1) k++;     for (int i = 0; i < k; i++) {       int u;       cin >> u;       l.push_back(u);     }     l.push_back(1);     vector<int> vec[k + 1];     int sum = 0;     int u = 1;     for (int i = 0; i <= k; i++) {       sum += dfs(u, l[i], vec[i], u);       u = l[i];     }     if (sum != 2 * n - 2)       cout <<  -1  <<   n ;     else {       cout <<  1  <<    ;       for (int i : ans) cout << i <<    ;     }   }   