Submission #434091

#	Time	Username	Problem	Language	Result	Execution time	Memory
434091		Tiago_Marques	Combo (IOI18_combo)	C++17	5 / 100	6 ms	200 KiB

combo

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

using namespace std;

std::string guess_sequence(int N)
{
    string s, p;
    char option[4] = {'A', 'B', 'X', 'Y'};
    int x;
    p = "AB";
    x = press(p);
    if (x)
    {
        p = "A";
        x = press(p);
        if (x)
        {
            s = "A";
        }
        else
        {
            s = "B";
            swap (option[0], option[1]);
        }
    }
    else
    {
        p = "X";
        x = press(p);
        if (x)
        {
            s = "X";
            swap (option[0], option[2]);
        }
        else
        {
            s = "Y";
            swap (option[0], option[3]);
        }
    }
    while ((int)s.size() < N - 1)
    {
        p.clear();
        p += s;
        p += option[1];
        p += option[1];
        p += s;
        p += option[1];
        p += option[2];
        p += s;
        p += option[1];
        p += option[3];
        p += s;
        p += option[2];
        p += option[0];
        x = press (p);
        if (x == (int)s.size())
        {
            s += option[3];
        }
        if (x == (int)s.size() + 1)
        {
            s += option[2];
        }
        if (x == (int)s.size() + 2)
        {
            s += option[1];
        }
    }
    s += option[1];
    if (press (s) == N)
        return s;
    s .pop_back();
    s += option[2];
    if (press(s) == N)
        return s;
    s.pop_back();
    s += option[3];
    return s;
}

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