#include "combo.h"
std::string guess_sequence(int N) {
std::string p = "";
int n = N;
char k[4] = {'A','B','X','Y'};
int first=999;
for(int i=0;i<3;i++)
{
std:: string ss = p;
ss = ss + k[i];
int kk = press(ss);
if(kk == 1)
{
first = i;
break;
}
}
if(first == 999 )//that means first haven't been changed
{
first = 3;
}
p = p + k[first];
for(int i=1;i<n;i++)
{
int flag = 0;
for(int j=0;j<3;j++)
{
if(j == first)continue;
std::string ss = p;
ss = ss + k[j];
if(press(ss) == i+1)
{
flag = 1;
p = p + k[j];
break;
}
}
if(flag == 0)
{
p = p + k[3];
}
}
return p;
}
