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Solution: Largest Number After Digit Swaps by Parity

Explore how to rearrange digits of a positive integer to create the largest possible number by swapping digits of the same parity. Understand the use of max-heaps to efficiently manage odd and even digits, enabling optimal swaps and mastering heap-based solutions.

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 ...