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Solution: Largest Number After Digit Swaps by Parity

Explore how to maximize a number by swapping its digits with others of the same parity. Learn to use max-heaps to efficiently organize and retrieve odd and even digits, and understand the approach to solve this problem with optimal time and space complexity.

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 ...