#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
/*
c = "abxy"
n = 8
abbxyxxb
y = n
x = n
b = n
udah pasti a
abax
*/
string guess_sequence(int n) {
// guess 1st char of s
// sisa question: n + 2 - 2 = n
string s;
int val = press("AB");
if (val == 2) {
s += 'A';
} else if (val == 1) {
if (press("A")) {
s += 'A';
} else {
s += 'B';
}
} else if (press("X")) {
s += 'X';
} else {
s += 'Y';
}
// length sisa (n - 1), question sisa n
vector<char> ch;
if (s[0] != 'A') {
ch.push_back('A');
}
if (s[0] != 'B') {
ch.push_back('B');
}
if (s[0] != 'X') {
ch.push_back('X');
}
if (s[0] != 'Y') {
ch.push_back('Y');
}
string p;
for (int i = 2; i <= n - 1; ++i) {
p = s + ch[0] + "" + s + ch[1] + "" + ch[0] + "" + s + ch[1] + "" + ch[1] + "" + s + ch[1] + "" + ch[2];
val = press(p);
if (val == i - 1) {
s += ch[2];
} else if (val == i) {
s += ch[0];
} else { // val == i + 1
s += ch[1];
}
}
p = s + ch[0] + s + ch[1];
val = press(p);
if (val == n) {
if (press(s + ch[0]) == n) {
s += ch[0];
} else {
s += ch[1];
}
} else { // val == n - 1
s += ch[2];
}
return s;
}
