#include "combo.h"
#include <iostream>
#include <cassert>
std::string guess_sequence(int N) {
std::string p = "";
for(const char c : std::string("ABX")) {
p += c;
if(press(p)) break;
else p = "";
}
if(p.empty()) p = "Y";
std::string chars = "";
for(const char c : std::string("ABXY"))
if(c && c != p[0])
chars += c;
for(int i = 1; i < N - 1; ++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:
assert(0);
}
}
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];
return p;
}
