Alpaca Senior Software Engineer interview questions

They asked me to write a lottery system during the offline code test.

This problem is related to the Hungarian lottery. In case you are not familiar with it: players pick 5 distinct numbers from 1 to 90. There is a weekly lottery picking event when the lotto organization picks 5 distinct numbers randomly between 1 and 90- just like the players did. The player's reward then depends on how many of the player's numbers match with the ones selected at the lotto picking. A player wins if he/she has 2, 3, 4 or 5 matching numbers. Now, the problem: at the lottery event, right after picking the numbers, a computer shall be able to report quickly that how many winners are in each category. This report shall be generated within a couple of seconds after picking the winner number. The player's numbers are known in advance - at least 1 hour ahead of the show. In peak periods there are about 5 million players, but to be sure we can assume it is not exceeding 10 million.