Submission #434447

#	Time	Username	Problem	Language	Result	Execution time	Memory
434447		chirathnirodha	Combo (IOI18_combo)	C++17	100 / 100	48 ms	692 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define MP make_pair
#define PB push_back
#define F first
#define S second
string guess_sequence(int N) {
  int x;string check;
  x=press("AB");
  string ans;
  if(x>0){
    if(x==1){
      x=press("A");
      if(x==1)ans.PB('A');
      else ans.PB('B');
    }
    else ans.PB('A');
  }
  else{
    x=press("X");
    if(x==1)ans.PB('X');
    else ans.PB('Y');
  }
  if(ans.size()==N)return ans;
  vector<char> rem;
  rem.PB('A');rem.PB('B');rem.PB('X');rem.PB('Y');
  for(int i=0;i<4;i++)if(rem[i]==ans[0]){rem.erase(rem.begin()+i);break;}
  for(int i=1;i<N-1;i++){
    check=(ans+rem[0]) + (ans+rem[1]+rem[0]) + (ans+rem[1]+rem[1]) + (ans+rem[1]+rem[2]);
    x=press(check)-ans.size();
    if(x==0)ans.PB(rem[2]);
    else if(x==1)ans.PB(rem[0]);
    else ans.PB(rem[1]);
  }
  check=ans+rem[0];x=press(check)-ans.size();
  if(x==1)ans.PB(rem[0]);
  else {
    check=ans+rem[1];x=press(check)-ans.size();
    if(x==1)ans.PB(rem[1]);
    else ans.PB(rem[2]);
  }
  return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:25:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   25 |   if(ans.size()==N)return ans;
      |      ~~~~~~~~~~^~~

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