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Grokking the Coding Interview Patterns

Solution: Remove Element

Explore how to apply the two pointers technique to remove all instances of a specified value from an integer array without extra memory allocation. Understand how to overwrite unwanted elements efficiently and return the count of remaining valid elements. This lesson helps you implement a solution with linear time and constant space complexity.

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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 ...