#include <combo.h>
#include <bits/stdc++.h>
#include <string>
#include <vector>
#include <iostream>
using namespace std;
int countchar[2000] = { 0 };
void countup()
{
countchar[0] += 1;
for (int i = 0; i < 1999; i++)
{
if (countchar[i] > 2)
{
countchar[i] = 0;
countchar[i + 1] += 1;
continue;
}
break;
}
}
string guess_sequence(int N)
{
string start;
if (press("AB") >= 1)
{
start = (press("A") == 1 ? "A" : "B");
}
else
start = (press("X") == 1 ? "X" : "Y");
if (N == 1)
return start;
vector<string> others = { "A", "B", "X", "Y" };
for (int i = 0; i < 4; i++)
if (others[i] == start)
{
others.erase(others.begin() + i);
break;
}
string check;
string result;
while (true)
{
check.clear();
for (int i = 0; i < 4; i++)
{
check += start;
for (int j = 0; j < N-1; j++)
{
check += others[countchar[j]];
}
countup();
}
if (press(check) == N)
{
if (press(check.substr(0, 2 * N)) == N)
{
result = (press(check.substr(0, N)) == N ? check.substr(0, N) : check.substr(N, N));
}
else
{
result = (press(check.substr(2 * N, N)) == N ? check.substr(2 * N, N) : check.substr(3 * N, N));
}
break;
}
}
return result;
}
