This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <combo.h>
#include<string>
using namespace std;
#define t press
string guess_sequence(int N)
{
std::string r, p, o = "ABXY";
int i, j, c;
r = t("AB") ? t("A") ? "A" : "B" : t("X") ? "X" : "Y";
if(N==1)return r;
for (i = 0; i < 4; i++)if (o[i] == r[0]){ o.erase(o.begin() + i); break; }
for (i = 1; i < N - 1;)
{
p = r + o[0]; for (j = 0; j < 3;){ p += r + o[1] + o[j++]; }
c = t(p);
r += o[c == i++ ? 2 : c == i + 1 ? 0 : 1];
}
r+=o[t(r+o[0]+r+o[1])==N?t(r+o[0])==N?0:1:2];
return r;
}
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