func_code_string: #include <bits/stdc++.h>   using namespace std;   bool F[2001][2001];   bool D[2001][2001];   int C[2001];   vector<int> V[2001];   int n;   void f(int v, int c) {     if (C[v]) return;     C[v] = c;     V[c].push_back(v);     for (int i = 1; i <= n; ++i)       if (F[v][i]) f(i, c);   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n;     int k;     cin >> k;     while (k--) {       int a, b;       cin >> a >> b;       F[a][b] = 1;       F[b][a] = 1;     }     cin >> k;     while (k--) {       int a, b;       cin >> a >> b;       D[a][b] = 1;       D[b][a] = 1;     }     int ans = 0;     for (int i = 1; i <= n; ++i) {       f(i, i);       int t = V[i].size();       for (int j = 0; j < t; ++j)         for (int l = 0; l < t; ++l)           if (D[V[i][j]][V[i][l]]) goto skip;       ans = max(ans, t);     skip:;     }     cout << ans << endl;     return 0;   }   