func_code_string: #include <bits/stdc++.h>   using namespace std;   int Abs(int x) {     if (x < 0) return -x;     return x;   }   int N, M, K;   bool no[2001][2001] = {false}, visited[2001] = {false}, rooted[2001] = {false},        notgo[2001];   vector<int> G[2001], g[2001];   int cn = 0;   bool run = true;   void dfs(int r) {     if (!run) return;     cn++;     visited[r] = true;     rooted[r] = true;     for (int i = 0; i < g[r].size(); i++) {       notgo[g[r][i]] = true;     }     for (int i = 0; i < G[r].size(); i++) {       if (notgo[G[r][i]]) run = false;       if (!visited[G[r][i]]) dfs(G[r][i]);     }   }   int main() {     scanf( %d , &N);     scanf( %d , &M);     for (int i = 0; i < M; i++) {       int v, u;       scanf( %d%d , &v, &u);       G[v].push_back(u);       G[u].push_back(v);     }     scanf( %d , &K);     for (int i = 0; i < K; i++) {       int v, u;       scanf( %d%d , &v, &u);       g[v].push_back(u);       g[u].push_back(v);     }     int ans = 0;     for (int i = 1; i <= N; i++) {       cn = 0;       run = true;       memset(visited, false, sizeof(visited));       memset(notgo, false, sizeof(notgo));       dfs(i);       if (run) ans = max(ans, cn);     }     cout << ans;     return 0;   }   