#include<bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int N){
string s="XY";
int r=press(s);
if (r){
s="X";
r=press(s);
if (!r){
s="Y";
}
}else{
s="A";
r=press(s);
if (!r){
s="B";
}
}
int n=1;
string s3="ABXY";
int st;
for (int i=0; i<4; i++){
if (s3[i]==s[0]){
st=i;
break;
}
}
while (n<N-1){
for (int i=0; i<4; i++){
if (i!=st){
for (int j=i+1; j<4; j++){
if (j!=st){
int k=6-st-i-j;
string s2="";
s2+=s;
s2+=s3[i];
s2+=s;
s2+=s3[j];
s2+=s3[i];
s2+=s;
s2+=s3[j];
s2+=s3[j];
s2+=s;
s2+=s3[j];
s2+=s3[k];
int r=press(s2);
if (r==n){
s+=s3[k];
}else if(r==n+1){
s+=s3[i];
}else{
s+=s3[j];
}
n++;
break;
}
}
break;
}
}
}
if (n==N-1){
int i, j;
for (i=0; i<4; i++){
if (i!=st){
string s2="";
s2+=s;
s2+=s3[i];
int r=press(s2);
if (r==n+1){
s+=s3[i];
return s;
}
break;
}
}
for (j=i+1; j<4; j++){
if (j!=st){
string s2="";
s2+=s;
s2+=s3[j];
int r=press(s2);
if (r==n+1){
s+=s3[j];
return s;
}
break;
}
}
s+=s3[6-st-i-j];
}
return s;
}
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