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Remove Element Test | Pre-employment assessment - Testlify
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Remove Element Test

Overview of Remove Element Test

The goal of the problem is to remove all the instances of the target value and returns the new length of the array.

Skills measured

  • Two pointers
  • greedy

Available in



Coding Test


20 Mins





Use of Remove Element test

The solution approach of the problem is to initializing two pointers, i and j, both pointing to the first element of the array.
We iterate through the array using the i pointer until it reaches the end of the array.
For each element at nums[i], we perform the following checks:
a. If the value at nums[i] is not equal to the given value val, it means we want to keep this element in the modified array. In this case, we assign the value at nums[i] to the position nums[j] in the array and increment j by 1. This effectively moves the valid elements to the beginning of the array.
b. If the value at nums[i] is equal to val, it means we want to remove this element from the array. In this case, we simply skip it and don't increment j. This ensures that j remains pointing to the next available position where a valid element can be placed.
c. After processing each element, we increment i by 1 to move on to the next element in the array.
Once the iteration is complete, we return the value of j. This value represents the new length of the modified array, as all the valid elements have been moved to the first j positions.

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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Two pointers

In the Remove Element algorithm, two pointers are used to efficiently identify and remove elements from an array. The first pointer, the slow pointer, is used to iterate through the array and identify elements that need to be removed. The second pointer, the fast pointer, is used to swap elements with the slow pointer when an element needs to be removed. This approach helps reduce the number of operations needed to remove elements, improving the algorithm's time complexity and efficiency. By utilizing two pointers, the Remove Element algorithm can effectively remove elements from an array without the need for additional data structures or excessive iterations.



The greedy skill covered in the Remove Element problem involves efficiently iterating through an array and removing a specific element without using extra space. This skill is important because it allows for a more optimized solution that reduces the time complexity of the algorithm. By greedily shifting elements to replace the target element, we can achieve a faster and more memory-efficient solution. This skill is useful in scenarios where memory constraints are a concern, or when we need to optimize the performance of our code. Mastering this greedy skill can lead to more efficient and scalable solutions in various programming problems.

The Remove Element test is created by a subject-matter expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

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