Submission #1082227

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082227		raphael_heuchl	Combo (IOI18_combo)	C++14	5 / 100	1 ms	344 KiB

combo

#include "combo.h"

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;
    
    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];
      if (press(guess) == ans.size())
        ans += s[2];
      else if (press(guess) == 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;
    }
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |     while (ans.size() < N - 1)
      |            ~~~~~~~~~~~^~~~~~~
combo.cpp:24:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |       if (press(guess) == ans.size())
      |           ~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:26:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |       else if (press(guess) == ans.size() + 1)
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:5:23: warning: control reaches end of non-void function [-Wreturn-type]
    5 |     std::string ans = "A";
      |                       ^~~

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