Submission #1082230

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082230		raphael_heuchl	Combo (IOI18_combo)	C++14	97 / 100	24 ms	1260 KiB

combo

#include "combo.h"
#include <iostream>

std::string guess_sequence(int N)
{
    std::string ans = "A";
    if (press("B"))
      ans = "B";
    else if (press("X"))
      ans = "X";
    else if (press("Y"))
      ans = "Y";
    std::string s = "";
    for (char c : (std::string)"ABXY")
      if (c != ans[0])
        s += c;
    if (N == 1)
      return ans;
    
    std::string guess;
    while (ans.size() < N - 1)
    {
      guess = ans + s[0] + \
      ans + s[1] + s[0] + \
      ans + s[1] + s[1] + \
      ans + s[1] + s[2];
      int res = press(guess);
      if (res == ans.size())
        ans += s[2];
      else if (res == ans.size() + 1)
        ans += s[0];
      else
        ans += s[1];
    }

    for (int i = 0; i < 3; ++i)
    {
      guess = ans + s[i];
      if (i == 2 || press(guess) == N)
         return guess;
    }

    return "";
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:21:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     while (ans.size() < N - 1)
      |            ~~~~~~~~~~~^~~~~~~
combo.cpp:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |       if (res == ans.size())
      |           ~~~~^~~~~~~~~~~~~
combo.cpp:30:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |       else if (res == ans.size() + 1)
      |                ~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95