func_code_string: #include <bits/stdc++.h>   using namespace std;   int par[200010];   bool isLeaf[200010];   vector<int> adj[200010];   long long f[200010], dp[200010], s[200010], ans = 0, n;   void duyet(int u) {     s[u] = 1;     f[u] = 0;     for (int i = 0; i < adj[u].size(); i++) {       int v = adj[u][i];       if (par[u] != v) {         par[v] = u;         duyet(v);         s[u] += s[v];         f[u] += f[v];       }     }     f[u] += s[u];   }   void cal(int u) {     long long tong = 0;     dp[u] = dp[par[u]] - 2 * s[u] + n;     ans = max(ans, dp[u]);     for (int i = 0; i < adj[u].size(); i++) {       int v = adj[u][i];       if (par[u] != v) {         cal(v);       }     }   }   void solve() {     cin >> n;     for (int i = 1; i < n; i++) {       int x, y;       cin >> x >> y;       par[i] = 0;       adj[x].push_back(y);       adj[y].push_back(x);     }     par[n] = 0;     duyet(1);     dp[1] = f[1];     for (int i = 0; i < adj[1].size(); i++) {       int v = adj[1][i];       cal(v);     }     cout << ans << endl;   }   int main() {     solve();     return 0;   }   