#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long
string guess_sequence(int N) {
vector<char> a = {'A', 'B', 'X', 'Y'};
string s;
if(press("AB") == 2){
s = "A";
}
else if(press("AB") == 1){
if(press("A") == 1){
s = "A";
}
else s = "B";
}
else if(press("XY") == 2){
s = "X";
}
else if(press("XY") == 1){
if(press("X") == 1){
s = "X";
}
else s = "Y";
}
ll cnt = 1;
vector<char> v;
for(int i = 0; i < 4; ++i){
if(a[i] != s[0]){
v.pb(a[i]);
}
}
char b = v[0], x = v[1], y = v[2];
while(cnt != N){
ll count = press(s + b + s + x + b + s + x + y + s + x + x);
if(count == 1){
s += b;
}
else if(count == 2){
s += x;
}
else s += y;
cnt++;
}
return s;
}
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