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Solution: Largest Number After Digit Swaps by Parity

Explore how to rearrange digits of a number to create the largest possible value by swapping only digits of the same parity. Learn to implement a solution using max-heaps for odd and even digits, ensuring efficient retrieval and placement. This lesson guides you through the algorithm steps, complexity analysis, and practical implementation, equipping you to handle parity-based digit swap problems effectively.

Statement

You are given a positive integer num. You can swap any two digits of num as long as they share the same parity (both are odd or both are even).

Your task is to return the largest possible value of num after performing any number of such swaps.

Constraints:

  • 11 \leq num 109\leq 10^9 ...