func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   const int N = 1e6 + 5;   int n, m, k;   bool vis[N];   int main() {     ios::sync_with_stdio(false);     cin >> n >> m >> k;     int h;     for (int i = 1; i <= m; i++) {       cin >> h;       vis[h] = 1;     }     bool fg = 0;     int bone = 1;     if (vis[bone]) fg = 1;     for (int i = 1; i <= k; i++) {       int u, v;       cin >> u >> v;       if ((u == bone || v == bone) && !fg) {         bone = (bone == u) ? v : u;         if (vis[bone]) fg = 1;       }     }     cout << bone << endl;     return 0;   }   