Submission #305035

#	Time	Username	Problem	Language	Result	Execution time	Memory
305035		mihai145	Combo (IOI18_combo)	C++14	30 / 100	56 ms	432 KiB

combo

#include "combo.h"
#include <vector>
#include <set>

std::string guess_sequence(int N)
{
    std::string s = "";

    ///first letter logic
    int coins = press("AB");
    if(coins == 0)
    {
        ///first letter is X or Y
        coins = press("X");
        if(coins == 0)
            s += "Y";
        else
            s += "X";
    }
    else
    {
        ///first letter is A or B
        coins = press("A");
        if(coins == 0)
            s += "B";
        else
            s += "A";
    }

    std::set <char> opts;
    opts.insert('A');
    opts.insert('B');
    opts.insert('X');
    opts.insert('Y');
    opts.erase(s[0]);

    std::vector <char> optv;
    for(auto it : opts)
        optv.push_back(it);

    for(int pos = 2; pos <= N; pos++)
        {
            coins = press(s + optv[0] + s + optv[1]);
            if(coins == s.size())
                s += optv[2];
            else
                {
                    coins = press(s + optv[0]);
                    if(coins == s.size())
                        s += optv[1];
                    else
                        s += optv[0];
                }
        }

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:44:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             if(coins == s.size())
      |                ~~~~~~^~~~~~~~~~~
combo.cpp:49:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |                     if(coins == s.size())
      |                        ~~~~~~^~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95