Submission #466808

#	Time	Username	Problem	Language	Result	Execution time	Memory
466808		jazzup	Combo (IOI18_combo)	C++14	100 / 100	43 ms	544 KiB

combo

#include "combo.h"

std::string guess_sequence(int N){
	std::string p = "";

	p="AB";
	char a[3];
	int m = press(p);
	int c;

	if(m==1){
		c=press("A");
		
		if(c==1){
			a[0]='B';
			a[1]='X';
			a[2]='Y';
			p="A";
		}
		else{
			a[0]='A';
			a[1]='X';
			a[2]='Y';
			p="B";
		}

	}

	else if(m==0){
		c=press("X");

		if(c==1){
			a[0]='A';
			a[1]='B';
			a[2]='Y';
			p="X";
		}
		else{
			a[0]='A';
			a[1]='B';
			a[2]='X';
			p="Y";
		}
	}

	else{
		a[0]='B';
		a[1]='X';
		a[2]='Y';
		if(N==2)return p;
	}

	if(N==1)return p;

	std::string S;
	int x=p.length();
	for(int i=x;i<N-1;i++){
		S=p;
		S+=a[0];
		S+=a[0];
		S+=p;
		S+=a[0];
		S+=a[1];
		S+=p;
		S+=a[0];
		S+=a[2];
		S+=p;
		S+=a[1];
		c=press(S);
		if(c==p.length()){
			p+=a[2];
		}
		else if(c==p.length()+1){
			p+=a[1];
		}
		else{
			p+=a[0];
		}
	}

	S=p;

	S+=a[0];

	c=press(S);

	if(c==p.length()+1)
		return S;

	else{
		S=p;
		S+=a[1];
		c=press(S);

		if(c==p.length()+1)
			return S;
		else{
			p+=a[2];
			return p;
		}
	}
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:70:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   if(c==p.length()){
      |      ~^~~~~~~~~~~~
combo.cpp:73:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |   else if(c==p.length()+1){
      |           ~^~~~~~~~~~~~~~
combo.cpp:87:6: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |  if(c==p.length()+1)
      |     ~^~~~~~~~~~~~~~
combo.cpp:95:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |   if(c==p.length()+1)
      |      ~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95