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Grokking the Coding Interview Patterns

Solution: Remove Element

Explore how to apply the two pointers pattern to remove all instances of a given value from an array in place. This lesson teaches you to overwrite unwanted elements efficiently, returning the count of remaining elements while maintaining optimal time and 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 ...