#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string del(string s, char ch) {
string t;
for (auto &x : s) {
if (x != ch) {
t += x;
}
}
return t;
}
mt19937 rng((long long) (new char));
string guess_sequence(int n) {
string sol;
string posi = "ABXY";
if (press(sol + posi[0] + posi[1]) > 0) {
if (press(sol + posi[0])) {
sol += posi[0];
} else {
sol += posi[1];
}
} else {
if (press(sol + posi[2])) {
sol += posi[2];
} else {
sol += posi[3];
}
}
posi = del(posi, sol[0]);
while ((int) sol.size() < n) {
bool found = 0;
shuffle(posi.begin(), posi.end(), rng);
for (int j = 0; j < 2; j++) {
if (press(sol + posi[j]) == (int) sol.size() + 1) {
found = 1;
sol += posi[j];
break;
}
}
if (found == 0) {
sol += posi[2];
}
}
return sol;
}
