#include "combo.h"
#include <vector>
using namespace std;
string guess_sequence(int N) {
string res="";
vector<char> ch;
if(press("AB")>0){
if(press("A")==1){
res="A";
ch = {'B','X','Y'};
}
else{
res="B";
ch = {'A','X','Y'};
}
}
else if(press("X")==1){
res="X";
ch = {'A','B','Y'};
}
else{
res="Y";
ch = {'A','B','X'};
}
if(N==1)return res;
string query="";
for(int i=1;i<N-1;i++){
for(int j=0;j<3;j++){
query+=res+ch[2]+ch[j];
}
query+=res+ch[1];
int response=press(query);
res+=ch[response-res.size()];
query="";
}
query=res+ch[0]+res+ch[1];
if(press(query)==N-1)res+=ch[2];
else if(press(res+ch[0])==N-1)res+=ch[1];
else res+=ch[0];
return res;
}
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