Design a hit counter to track the number of hits recorded in the past 5 minutes. Implement methods to record a hit and retrieve the total hits in the past 5 minutes.

Implement a Tic-Tac-Toe game where players take turns placing their marks. Design the game logic to efficiently determine the winner after each move.

Convert an IP address and a number of addresses to a CIDR block representation. Find the smallest list of CIDR blocks that covers the specified range of IP addresses.