#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
set<char> X = {'A', 'B', 'X', 'Y'};
string s = "";
for (auto it = X.begin(); it != X.end(); it++) {
int x = press(s + *it);
if (x != 0) {
s += *it;
X.erase(it);
break;
}
}
if (s == "") {
return s;
}
int prev = 1;
while (true) {
int sz = (int) s.size();
if (sz == N - 1) {
auto it = X.begin();
if (press(s + *it) > prev) {
return (s + *it);
}
++it;
if (press(s + *it) > prev) {
return (s + *it);
}
++it;
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;
}
}
}
}
}
