#include "combo.h"
#include <iostream>
#include <cassert>
std::string guess_sequence(int N) {
std::string p = "";
if(press("AB"))
p = press("A") ? "A" : "B";
else
p = press("X") ? "X" : "Y";
if(N == 1) return p;
std::string chars = "";
for(const char c : std::string("ABXY"))
if(c && c != p[0])
chars += c;
assert(int(chars.size()) == 3);
for(int i = 1; i < N - 1; ++i) {
assert(int(p.size()) == i);
std::string a, b, c, d;
a = p + chars[0];
b = p + chars[1] + chars[0];
c = p + chars[1] + chars[1];
d = p + chars[1] + chars[2];
switch(press(a + b + c + d) - i) {
case 0:
p += chars[2];
break;
case 1:
p += chars[0];
break;
case 2:
p += chars[1];
break;
default:
std::cout << p << ' ' << press(a + b + c + d) << ' ' << i << '\n';
assert(0);
}
}
assert(int(p.size()) == N - 1);
for(const char c : chars)
if(c != chars[0] && press(p + c) == N) {
p += c;
break;
}
if(int(p.size()) == N - 1) p += chars[0];
assert(int(p.size()) == N);
return p;
}
