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vector<pi> q;
  for(int i=0; i<n; i++) {
    q.pb({adj[i].size(), i});
  }
 
  sort(all(q));
  vector<bool> chosen(n, false);
  vector<int> ans;
  target = k%2==0?k/2:k/2+1;
  for(auto x:q){
    if(chosen[x.second])
      continue;
    ans.pb(x.second);
    for(auto y:adj[x.second])
      chosen[y] = true;
 
    if(ans.size()==target)
      break;  
  }
 

prog.cpp:1:1: error: ‘vector’ does not name a type
 vector<pi> q;
 ^~~~~~
prog.cpp:2:3: error: expected unqualified-id before ‘for’
   for(int i=0; i<n; i++) {
   ^~~
prog.cpp:2:16: error: ‘i’ does not name a type
   for(int i=0; i<n; i++) {
                ^
prog.cpp:2:21: error: ‘i’ does not name a type
   for(int i=0; i<n; i++) {
                     ^
prog.cpp:6:7: error: expected constructor, destructor, or type conversion before ‘(’ token
   sort(all(q));
       ^
prog.cpp:7:3: error: ‘vector’ does not name a type
   vector<bool> chosen(n, false);
   ^~~~~~
prog.cpp:8:3: error: ‘vector’ does not name a type
   vector<int> ans;
   ^~~~~~
prog.cpp:9:3: error: ‘target’ does not name a type
   target = k%2==0?k/2:k/2+1;
   ^~~~~~
prog.cpp:10:3: error: expected unqualified-id before ‘for’
   for(auto x:q){
   ^~~

Standard output is empty