exp_moodle

#include<bits/stdc++.h>
using namespace std;

int N;
char buf[65536];

string find_answer(string s){
  string search = "<label for=\"";
  int id;
  if( ( id = s.find(search) ) == string::npos) return "";
  string sub = s.substr( s.find(search) + search.size() );
  int i = 0;
  while( sub[i] != '>' ){
    ++i;
  }
  i+=4;
  string sub2 = sub.substr(i);
  return sub2.substr( 0, sub2.find("</label>") );
}

int main(){
  while( fgets(buf,sizeof(buf),stdin) != '\0'){
    string S = buf;
    string search1 = "<div class=\"qtext\">";
    int id;
    if( (id = S.find( search1 )) != string::npos ) {
      string sub = S.substr( id + search1.size() );
      string q = sub.substr(0, sub.find("</div>"));
      cout << "question::" << endl;
      cout << q << endl;
      
      int correct=-1;
      int wrong = -1;
      string ans[3];
      ans[0] = find_answer(S);
      if( S.find( "Correct!" ) != string::npos) correct = 0;
      if( S.find( "Wrong!" ) != string::npos) wrong = 0;
      for(int i=1;i<3;i++) {
	fgets(buf,sizeof(buf),stdin);
	S = buf;
	ans[i] = find_answer(S);
	if( S.find( "Correct!" ) != string::npos) correct = i;
	if( S.find( "Wrong!" ) != string::npos) wrong = i;
      }

      if( correct == -1 ){
	cout << "answer 2" << endl;
	for(int i=0;i<3;i++){
	  if( i == wrong ) continue;
	  cout << ans[i] << endl;
	}
      } else {
	cout << "answer 1" << endl;
	cout << ans[correct] << endl;
      }
      cout << endl;
    }
    
  }
}