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Grokking the Coding Interview Patterns in C#

Solution: Remove Element

Understand how to solve the problem of removing specific elements from an array efficiently using the two-pointer technique. This lesson teaches you to modify the array in place without extra memory, ensuring all valid elements are shifted forward, and returns the count of remaining elements.

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Statement

You are given an integer array, nums, and an integer, val. Your task is to remove all occurrences of val from nums in place, meaning no additional memory allocation should be used. The relative order of the elements in the array may be changed. After modifying the array, return the number of elements that are not equal to val.

Let ...