Submission #1105125

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105125		thelegendary08	Combo (IOI18_combo)	C++14	100 / 100	29 ms	1872 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
	int r = press("AB");
	char f;
	if(r >= 1){
		r = press("A");
		if(r == 1)f = 'A';
		else f = 'B';
	}
	else{
		r = press("X");
		if(r == 1)f = 'X';
		else f = 'Y';
	}
	vector<char>cs = {'A', 'B', 'X', 'Y'};
	vector<char>e;
	for(auto u : cs){
		if(u != f)e.push_back(u);
	}
	//for(auto u : e)cout<<u<<' ';
	//cout<<'\n';
	string s = "";
	s+=f;
	//cout<<s<<'\n';
  	for(int i = 1; i<N-1; i++){
  		string quer = "";
  		quer += s;
  		quer += e[0];
  		//cout<<quer<<" QUER"<<'\n';
  		for(auto u : e){
  			quer += s;
  			quer += e[1];
  			quer += u;
  		}
  		//cout<<quer<<" QUER"<<'\n';
  		r = press(quer);
  		if(r == s.size()){
  			s += e[2];
  		}
  		else if(r == s.size() + 1){
  			s += e[0];
  		}
  		else s += e[1];
  	}
  	if(N != 1){
  		r = press(s + e[0]);
  		if(r == N){
  			s += e[0];
  		}
  		else{
  			r = press(s + e[1]);
  			if(r == N){
  				s += e[1];
  			}
  			else s += e[2];
  		}
  	}
  	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:39:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     if(r == s.size()){
      |        ~~^~~~~~~~~~~
combo.cpp:42:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     else if(r == s.size() + 1){
      |             ~~^~~~~~~~~~~~~~~

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