#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int n) {
string ans="";
vector<char> v={'A','B','X','Y'};
bool check=false;
for(int i = 0; i < 3; i++){
string s="";
s+=v[i];
int x=press(s);
if(x==1){
ans+=v[i];
v.erase(v.begin()+i);
check=true;
break;
}
}
if(!check){
ans+=v[3];
v.pop_back();
}
int l=1;
for(int i = 1; i < n; i++){
check=false;
for(int j = 0; j < 2; j++){
int x=press(ans+v[j]);
if(x>l){
check=true;
ans+=v[j];
l=x;
break;
}
}
if(!check){
ans+=v[2];
l++;
}
}
return ans;
}
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