#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
string ans;
string var;
int prev = 0;
for (int cur = 0; cur < N; cur++) {
if (ans.size() == 0) {
if (press("A"))
ans += "A";
else if (press("B"))
ans += "B";
else if (press("X"))
ans += "X";
else
ans += "Y";
for (int i = 0; i < 4; i++) {
if (i == 0 && ans == "A")
continue;
if (i == 1 && ans == "B")
continue;
if (i == 2 && ans == "X")
continue;
if (i == 3 && ans == "Y")
continue;
if (i == 0)
var += "A";
else if (i == 1)
var += "B";
else if (i == 2)
var += "X";
else
var += "Y";
}
prev = 1;
} else {
for (int i = 0; i < 2; i++) {
int res = press(ans + var[i]);
if (res > prev) {
prev = res;
ans += var[i];
break;
}
}
if (prev == cur) {
ans += var[2];
prev++;
}
}
}
return ans;
}
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