#include "combo.h"
#include "bits/stdc++.h"
#include <cassert>
using namespace std;
#define isz(x) (int)x.size()
string guess_sequence(int n) {
string res;
vector<char> t(3);
if (press("AB") >= 1) {
if (press("A") == 1) {
res = res + 'A';
t = {'B', 'X', 'Y'};
} else {
res = res + 'B';
t = {'A', 'X', 'Y'};
}
} else {
if (press("X") == 1) {
res = res + 'X';
t = {'B', 'A', 'Y'};
} else {
res = res + 'Y';
t = {'A', 'X', 'B'};
}
}
if (n == 1) return res;
int cnt = 1;
for (int i = 1; i <= n-2; i++) {
string s = res + t[0] + t[0] + res + t[0] + t[1] + res + t[0] + t[2] + res + t[1];
int x = press(s);
int prev = cnt;
if (x == isz(res) + 2) {
res = res + t[0];
cnt++;
} else if (x == isz(res) + 1) {
res = res + t[1];
cnt++;
} else if (x == isz(res)) {
res = res + t[2];
cnt++;
}
}
if (press(res + t[0]) == isz(res) + 1) {
res += t[0];
} else if (press(res + t[1]) == isz(res) + 1) {
res += t[1];
} else {
res += t[2];
}
return res;
}
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