Learn how to solve the Leetcode problem of id 27, whose title is Remove Element, using the Java programming language.

https://leetcode.com/problems/remove-element

The Data Structures and Algorithms (DSA) lesson uses an iterative approach with a position pointer to solve the problem.

Initialize a pointer k that points to the first element in the array.

The pointer k will be the destination swap position of the element that doesn't match the given val, as you iterate through the array.

If the current value matches the val you want to remove, you simply ignore it and move on to the next iteration.

However, a value that does not match the value you want to remove would be copied to the position k.

By the end of the loop, all of the non-val elements would have been copied to the left-hand side of the array.

The right-hand side of the array would just be ignored, deemed garbage.

Since k increases everytime a non-matching value is seen, by the end of the loop k holds the count of elements of the array that are not equal to the remove value.

The time complexity for the solution is O(n) and its space complexity is O(1).

DSA problems are sometimes asked during tech job interviews for positions such as Software Engineer, so you can use the challenge to practice that skill.