Submission #988901

#	Time	Username	Problem	Language	Result	Execution time	Memory
988901		lo0ker	Combo (IOI18_combo)	C++17	5 / 100	1 ms	408 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;


string guess_sequence(int N) {
  if(N == 1){
    if(press("A") == 1){
      return "A";
    }
    else if(press("B") == 1){
      return "B";
    }
    else if(press("X") == 1){
      return "X";
    }
    else "Y";
  }
  string s = "";
  int k = press("AB");
  if(k > 0){
    if(press("A") == 1){
      s = "A";
    }
    else{
      s = "B";
    }
  }
  else{
    if(press("X") == 1){
      s = "X";
    }
    else{
      s = "Y";
    }
  }

  string c = "ABXY";
  c.erase(find(c.begin(), c.end(), s[0]));

  while(s.size() < N-1){
    string q = s + c[1] + s + c[2] + c[0] + s + c[2] + c[1] + s + c[2] + c[2];
    s += c[press(q) - s.size()];
  }

  if(press(s + c[0]) == N){
    s += c[0];
  }
  else if(press(s + c[1]) == N){
    s += c[1];
  }
  else{
    s += c[2];
  }
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:10: warning: statement has no effect [-Wunused-value]
   18 |     else "Y";
      |          ^~~
combo.cpp:42:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |   while(s.size() < N-1){
      |         ~~~~~~~~~^~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95