#include "combo.h"
#include <vector>
using namespace std;
string chars = "ABXY";
string guess_sequence(int N) {
string S = "";
for(int i = 0; i < 4; i++){
int res = press(to_string(chars[i]));
if(res) S+=chars[i];
}
for(int i = 0; i < N-1; i++){
for(int j = 0; j < 4; j++){
if(chars[j]==S[0]) continue;
int res = press(S+chars[j]);
if(res==S.length()+1) S+=chars[j];
}
}
return S;
}
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