Submission #574996

#	Time	Username	Problem	Language	Result	Execution time	Memory
574996		Hackapie	Combo (IOI18_combo)	C++17	100 / 100	36 ms	648 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
 
std::string guess_sequence(int N){
  set<char> s;
  s.insert('A');
  s.insert('B');
  s.insert('X');
  s.insert('Y');
  string res;
  string check;
  if(N==1){
      if(press("A"))return "A";
      else if(press("B")) return "B";
      else if(press("X")) return "X";
      else return "Y"; 
  }
  int ans=press("AB");
  if(ans){
      if(press("A"))res+='A';
      else res+='B';
  }else{
      if(press("X"))res+='X';
      else res+='Y';
  }
  s.erase(res[0]);
  for(auto x:s)check+=x;
  while(res.size()<N-1){
    string ch=res+check[1]+res+check[2]+check[0]+res+check[2]+check[1]+res+check[2]+check[2];
    res+=check[press(ch)-res.size()];
  }   
  if(press(res+check[0])==N){
      res+=check[0];
  }else if(press(res+check[1])==N){
      res+=check[1];
  }else res+=check[2];
  
return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |   while(res.size()<N-1){
      |         ~~~~~~~~~~^~~~

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