Submission #770043

#	Time	Username	Problem	Language	Result	Execution time	Memory
770043		teamariaa	Combo (IOI18_combo)	C++17	100 / 100	31 ms	536 KiB

combo

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

using namespace std;

string guess_sequence(int N)
{
    string s, letters;
    int cost = press("AB");
    if(cost > 0)
    {
        cost = press("A");
        if(cost == 1)
            s += 'A', letters += "BXY";
        else
            s += 'B', letters += "AXY";
    }
    else
    {
        cost = press("X");
        if(cost == 1)
            s += 'X', letters += "ABY";
        else
            s += 'Y', letters += "ABX";
    }
//    cout << s << " " << letters << "\n";

    for(int i = 2; i <= N - 1; i++)
    {
        string x;
        x = s + letters[0] + s + letters[1] +letters[0] + s + letters[1] + letters[1] + s + letters[1] +letters[2];
        int cost = press(x);
        if(cost == s.size())
            s += letters[2];
        else if(cost == s.size() + 1)
            s += letters[0];
        else
            s += letters[1];
//        cout << s << "\n";
    }

    if(N > 1)
    {
        string idk = s;
        if(press(idk + letters[0]) == N)
            s += letters[0];
        else if(press(idk + letters[1]) == N)
            s += letters[1];
        else
            s += letters[2];
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:33:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         if(cost == s.size())
      |            ~~~~~^~~~~~~~~~~
combo.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         else if(cost == s.size() + 1)
      |                 ~~~~~^~~~~~~~~~~~~~~

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