Custom Stack Min Operation

Implement a custom stack that supports the following operations: 'push', 'pop', 'top', and 'get_min'. Each operation must run in O(1) time. The 'push' operation adds an integer to the stack, 'pop' removes the top integer, 'top' returns the top integer, and 'get_min' returns the minimum integer in the stack. If 'get_min' is called on an empty stack, return None. Input Format: - Multiple lines where the first line is an integer n, the subsequent n lines contain commands: 'push x', 'pop', 'top', and 'get_min'. Output Format: - For each command that returns a value (top and get_min), print the value. Example: Input: 5 push 3 push 5 get_min top pop get_min Output: 3 5 3