#include <bits/stdc++.h>
#include "combo.h"
#define x first
#define y second
#define all(v) v.begin(), v.end()
#define chkmin(a, b) a = min(a, b)
#define chkmax(a, b) a = max(a, b)
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vii;
mt19937 rng(time(0));
//char letters[] = {'A', 'B', 'X', 'Y'};
string buttons[] = {"A", "B", "X", "Y"};
string guess_sequence(int n) {
string p = "";
if (press("AB") >= 1) {
if (press("A") >= 1) p.push_back('A');
else p.push_back('B');
} else {
if (press("X") >= 1) p.push_back('X');
else p.push_back('Y');
}
vector<string> letters;
for (string s : buttons) {
if (s[0] != p[0]) letters.push_back(s);
}
for (int i = 1; i < n; i++) {
shuffle(all(letters), rng);
string curr = p + letters[0] + p + letters[1];
if (press(curr) >= i + 1) {
curr = p + letters[0];
if (press(curr) >= i + 1) p += letters[0];
else p += letters[1];
} else {
p += letters[2];
// curr = p + "X";
// if (press(curr) >= i + 1) p.push_back('X');
// else p.push_back('Y');
}
// for (char c : letters) {
// if (i && c == p[0]) continue;
// p.push_back(c);
// if (press(p) == p.size()) break;
// p.pop_back();
// }
}
return p;
}
