Submission #1236990

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236990		pcp	Combo (IOI18_combo)	C++20	100 / 100	7 ms	488 KiB

combo

#include "combo.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;
std::string guess_sequence(int N) {
  std::string p = "";

  string lts = "ABXY";

  string l=""; 
  string lt="";
  if (press("AB")){
    p = (press("A")) ? "A" : "B";
    
  }else {
    p = (press("X")) ? "X" : "Y";
  }

  for (char x : lts){
    if (x==p.back())continue;
    if ((int)lt.size()==2)l+=x;
    else{
      lt+=x;
    }
  } 


  while ((int)p.size() < N){
    if (p.size()==N-1){
      if (press(p+lt[0])==N)p+=lt[0];
      else if (press(p+lt[1])==N)p+=lt[1];
      else p+=l;
    }
    else{
      string juan = p+lt[0]+lt[1]   +p+lt[0]+l  +p+lt[0]+lt[0]    +p+lt[1];
      int rslt=press(juan);
      if (rslt == (int)p.size())p+=l;
      else if (rslt==(int)p.size()+1) p+=lt[1];
      else p+=lt[0];
    }
  }


  return p;
}

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