When I open the contest standings, my computer freezes. Mike please fix it!

In yesterday's Div 3 contest in problem D, I used unordered_map to store elements, thinking it would be faster, but someone cracked my code, and my friend who had almost the same code, but used map instead of unordered_map, could not be cracked. Why was my code hacked, because unordered_map is faster than map, right? I have not been able to reach a clear answer to this question. So I ask from the respected Codeforces community, why did this happen? Thanks in advance for your answer.