Submission #928612

#	Time	Username	Problem	Language	Result	Execution time	Memory
928612		AtabayRajabli	Combo (IOI18_combo)	C++17	100 / 100	13 ms	1836 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
std::string guess_sequence(int N)
{
    std::string s = "";
    std::string t = "ABXY";
    int ind = 0;
    if(press("AB"))
    {
        if(press("A"))ind = 0;
        else ind = 1;
    }
    else
    {
        if(press("X"))ind = 2;
        else s = ind = 3;
    }
    s = t[ind];
    t.erase(t.begin() + ind);
    
    for(int i = 1; i < N - 1; i++)
    {
        std::string c = (s + t[0]) + (s + t[1] + t[0]) + (s + t[1] + t[1]) + (s + t[1] + t[2]);
        int p = press(c);
        
        if(p == i + 1)s += t[0];
        else if(p == i + 2)s += t[1];
        else s += t[2];
    }

    if(s.size() < N && press(s + "A" + s + "B") == N)
    {
        if(press(s + "A") == N)s += "A";
        else s += "B";
    }
    else if(s.size() < N)
    {
        if(press(s + "X") == N)s += "X";
        else s += "Y";
    }

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   31 |     if(s.size() < N && press(s + "A" + s + "B") == N)
      |        ~~~~~~~~~^~~
combo.cpp:36:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     else if(s.size() < N)
      |             ~~~~~~~~~^~~

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