func_code_string: #include <bits/stdc++.h>   using namespace std;   long long t = 1;   void solve() {     long long n, x, y, cnt = 0, p = 1;     cin >> n;     vector<long long> arr(n + 1), vis(n + 1, 0);     vector<vector<long long> > v(n + 1);     for (long long i = 0; i < n - 1; i += 1) {       cin >> x >> y;       v[x].push_back(y);       v[y].push_back(x);     }     queue<long long> q1, q;     for (long long i = 0; i < n; i += 1) {       cin >> x;       arr[i] = x;       q1.push(x);     }     q.push(1);     q1.pop();     while (!q.empty()) {       x = q.front();       vector<long long> vv;       set<long long> s;       cnt = 0;       for (long long i = 0; i < int((v[x]).size()); i += 1) {         if (vis[v[x][i]] == 0) {           cnt++;           vv.push_back(v[x][i]);         }       }       vis[q.front()] = 1;       q.pop();       for (long long i = p; i < p + cnt; i += 1) {         s.insert(arr[i]);         q.push(arr[i]);         vis[arr[i]] = 1;       }       for (long long i = 0; i < int((vv).size()); i += 1) {         if (((s).find(vv[i]) != (s).end())) {           s.erase(vv[i]);         } else {           cout <<  No ;           return;         }       }       p = p + cnt;     }     cout <<  Yes ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     while (t--) solve();     return 0;   }   