#include<bits//stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int N) {
string s,x="ABXY";
set<string>st;
int mx=0,cur;
for(;;){
bool ok=0;
for(char j:x){
s+=j;
if(!st.count(s)){
cur=press(s);
if(cur>mx){
mx=cur;
ok=1;
break;
}
st.insert(s);
}
s.pop_back();
}
if(!ok)break;
}
for(;;){
bool ok=0;
for(char j:x){
s=j+s;
if(!st.count(s)){
cur=press(s);
if(cur>mx){
mx=cur;
ok=1;
break;
}
st.insert(s);
}
reverse(begin(s),end(s));
s.pop_back();
reverse(begin(s),end(s));
}
if(!ok)break;
}
return s;
}
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