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Solution: Sort Array By Parity II

Explore how to solve the Sort Array By Parity II problem by applying a modified cyclic sort technique. Learn to use two pointers to rearrange elements in-place and achieve the desired parity placement efficiently with O(n) time and O(1) space complexity.

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Statement

You are given an integer array, nums, where exactly half of the elements are even, and the other half are odd.

Rearrange nums such that:

  • All even numbers are placed at even indexes [0,2,4,...][0, 2, 4, ...].

  • All odd numbers are placed at odd indexes [1,3,5,...][1, 3, 5, ...].

You may return any valid arrangement that satisfies these conditions.

Constraints: ...