#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
set<char> X = {'A', 'B', 'X', 'Y'};
string s = "";
if (N < 2) {
if (press("A")) {
return "A";
}
if (press("B")) {
return "B";
}
if (press("X")) {
return "X";
}
return "Y";
} else {
int t = press("AB");
if (t > 0) {
if (press("A")) {
s += "A";
} else {
s += "B";
}
} else {
if (press("X")) {
s += "X";
} else {
s += "Y";
}
}
}
int prev = 1;
while (true) {
int sz = (int) s.size(), c = 0;
if (sz == N - 1) {
for (auto it = X.begin(); it != X.end(); it++, c++) {
string poss = s + *it;
int x = press(poss);
if (x > prev) {
return poss;
}
if (c == 1) {
return s + *(++it);
}
}
}
// vector<string> extraX = {"XX", "XY", "XB"};
// vector<string> extraA = {"AX", "AY", "AB"};
// vector<string> extraB = {"BA", "BX", "BY"};
// vector<string> extraY = {"YX", "YA", "YB"};
if (s[0] == 'A') {
int x = press(s + "Y" + s + "XX" + s + "XY" + s + "XB");
if (x == prev) {
s += 'B';
prev++;
continue;
} else {
if (x == prev + 1) {
s += "Y";
prev++;
continue;
} else {
s += "X";
prev++;
continue;
}
}
}
if (s[0] == 'B') {
int x = press(s + "Y" + s + "XX" + s + "XY" + s + "XA");
if (x == prev) {
s += 'A';
prev++;
continue;
} else {
if (x == prev + 1) {
s += "Y";
prev++;
continue;
} else {
s += "X";
prev++;
continue;
}
}
}
if (s[0] == 'X') {
int x = press(s + "Y" + s + "BB" + s + "BY" + s + "BA");
if (x == prev) {
s += 'A';
prev++;
continue;
} else {
if (x == prev + 1) {
s += "Y";
prev++;
continue;
} else {
s += "B";
prev++;
continue;
}
}
}
if (s[0] == 'Y') {
int x = press(s + "B" + s + "XX" + s + "XB" + s + "XA");
if (x == prev) {
s += 'A';
prev++;
continue;
} else {
if (x == prev + 1) {
s += "B";
prev++;
continue;
} else {
s += "X";
prev++;
continue;
}
}
}
}
return s;
}
