Submission #916930

#	Time	Username	Problem	Language	Result	Execution time	Memory
916930		manishjha91	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

std::string guess_sequence(int N){
	using namespace std;
	string v = "ABXY";
	string s = "";
	int f = -1;
	for(int i=0; i<2; i++)
	{
		if(f!=-1) break;
		string curr = ""+string(1,v[2*i]) + string(1,v[2*i+1]);
		if(press(curr))
		{
			for(int j=0; j<2; j++)
			{
				if(press(string(1,v[2*i+j])))
				{
					f = 2*i + j;
					break;
				}
			}
		}
	}
	s.push_back(v[f]);
	swap(v[f],v.back());
	v.pop_back();
	
	for(int i=0; i<N-2; i++)
	{
		int n = s.size();
		string s1 = s;
		string s2 = s;
		string s3 = s;
		string s4 = s;

		s1 = s1 + v[0]+v[0];
		s2 = s2 + v[0]+v[1];
		s3 = s3 + v[0]+v[2];
		s4 = s4 + v[1];
		
		
		string curr = s1 + s2 + s3 + s4;
		
		
		int cnt = press(curr);
		if(cnt==n+2)
		{
			s.push_back(v[0]);
		}
		else if(cnt==n+1) s.push_back(v[1]);
		else s.push_back(v[2]);
	}
	
	s.push_back(v[0]);
	if(press(s)==N)
	{
		return s;
	}
	s.pop_back();
	s.push_back(v[1]);
	if(press(s)==N)
	{
		return s;
	}
	s.pop_back();
	s.push_back(v[2]);
	return s;
	
	
}

Compilation message (stderr)

combo.cpp:2:6: error: 'string' in namespace 'std' does not name a type
    2 | std::string guess_sequence(int N){
      |      ^~~~~~
combo.cpp:1:1: note: 'std::string' is defined in header '<string>'; did you forget to '#include <string>'?
  +++ |+#include <string>
    1 |