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Grokking the Coding Interview Patterns in Python

Solution: Remove Element

Understand how to efficiently remove specified elements from an integer array in place by using two pointers. This lesson guides you through modifying the array without extra memory allocation and returning the count of remaining valid elements. You will learn to implement the algorithm with linear time complexity and constant space.

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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 kk represent the number of elements in nums that are not equal to val. To successfully solve this problem, you need to ensure the following:

  • Modify the array, nums, such that the first kk elements contain values that are not equal to val.

  • The remaining elements in the array do not matter, and the size of nums is irrelevant after the first ...