func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int len[500020];   vector<int> s[500020];   vector<int> g[500020];   int col[500020];   set<int> FK;   int c;   int rt;   void dfs(int u, int p) {     if (p) {       vector<int> t;       int k = c;       for (auto v : s[u]) {         if (!col[v]) continue;         FK.erase(col[v]);         t.push_back(col[v]);       }       k = 0;       set<int>::iterator it = FK.begin();       for (auto v : s[u]) {         if (col[v]) continue;         col[v] = *it;         ++it;       }       for (auto v : t) {         FK.insert(v);       }       t.clear();     }     for (auto v : g[u]) {       if (v == p) continue;       dfs(v, u);     }   }   int main() {     scanf( %d%d , &n, &m);     rt = 0;     int tmp = 0;     for (int i = 1; i <= n; ++i) {       scanf( %d , &len[i]);       for (int j = 1; j <= len[i]; ++j) {         int v;         scanf( %d , &v);         s[i].push_back(v);       }       if (len[i] > tmp) {         tmp = len[i], rt = i;       }     }     for (int i = 1; i < n; ++i) {       int u, v;       scanf( %d%d , &u, &v);       g[u].push_back(v);       g[v].push_back(u);     }     int t = 0;     for (auto v : s[rt]) {       col[v] = ++t;     }     c = max(tmp, 1);     for (int i = 1; i <= c; ++i) FK.insert(i);     dfs(rt, 0);     for (int i = 1; i <= m; ++i)       if (!col[i]) col[i] = 1;     printf( %d n , c);     for (int i = 1; i <= m; ++i) printf( %d%c , col[i], i == m ?   n  :    );     return 0;   }   