3443 Maximum Manhattan Distance After K Changes

Описание: 3443 Maximum Manhattan Distance After K Changes. This Java code defines a method to find the
maximum possible "distance" in a string of directions ('N', 'S', 'E', 'W') after flipping up to k characters.
How it works:
It counts how many times each direction appears as it goes through the string.
It tries to balance opposite directions (N vs S, E vs W) by flipping some characters (up to k flips).
It calculates two possible distances considering different ways to use the flips.
The distance is roughly how far you can end up from the start after these flips.
The method returns the maximum distance found at any point in the string.
In short, it finds the maximum distance you can achieve by changing up to k directions in the given string.