map(int, input().split())

This line of code reads a line of input from the user, splits it into a list of strings based on spaces, and then maps the int function to each element of the list, converting them from strings to integers.

For example, if the user enters "1 2 3", the code will create a list ['1', '2', '3'] and then map the int function to each element, resulting in a new list [1, 2, 3].

This can be useful when you need to read in multiple integers from the user and want to avoid manually converting each string to an int.