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Grokking the Coding Interview Patterns in C#

Solution: Sort Array By Parity II

Explore how to solve the Sort Array By Parity II problem by applying a modified cyclic sort combined with two-pointer technique. This lesson guides you to rearrange elements efficiently in place, ensuring even numbers appear at even indices and odd numbers at odd indices. Understand the time and space complexity and implement a clean, optimal solution in C#.

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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: ...