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 <iostream>
#include "combo.h"
char let[4] = {'A', 'B', 'X', 'Y'};
std::string ans, guess;
std::string guess_sequence(int n)
{
int letIdx = 3;
for (int i = 0 ; i < 3 ; ++i)
{
ans += let[i];
if (press(ans))
{
letIdx = i;
break;
}
ans.pop_back();
}
if (letIdx == 3) ans += let[3];
std::swap(let[letIdx], let[3]);
for (int i = 2 ; i <= n-1 ; ++i)
{
guess = ans; guess += let[0];
guess += ans + let[1] + let[0];
guess += ans + let[1] + let[1];
guess += ans + let[1] + let[2];
int res = press(guess);
if (res == i) ans += let[0];
if (res == i+1) ans += let[1];
if (res == i-1) ans += let[2];
}
guess = ans + let[0];
if (press(guess) == n) return ans += let[0];
guess = ans + let[1];
if (press(guess) == n) return ans += let[1];
return ans += let[2];
}
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