#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string chars = "ABXY";
string guess_sequence(int N) {
string S = "";
if(press("AB")){
S+=(press("A") ? 'A' : 'B');
}else{
S+=(press("X") ? 'X' : 'Y');
}
vector<char> first;
for(int j = 0; j < 4; j++){
if(chars[j]==S[0]) continue;
first.push_back(chars[j]);
}
for(int i = 0; i < N-2; i++){
vector<string> opts;
for(int j = 0; j < 4; j++){
if(chars[j]==S[0]) continue;
string opt = S;
opt+=first[0];
opt+=chars[j];
opts.push_back(opt);
}
opts.push_back(S+first[1]);
int res = press(opts[0]+opts[1]+opts[2]+opts[3]);
if(res==i+3) S+=first[0];
else if(res==i+2) S+=first[1];
else S+=first[2];
}
if(N>1){
if(press(S+first[0]+S+first[1])==N){
if(press(S+first[0])==N){
S+=first[0];
}else S+=first[1];
}else S+=first[2];
}
return S;
}
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