Reverse String - Leetcode 344 - Java

Learn how to solve the Leetcode problem of id 344, whose title is Reverse String, using the Java programming language.

https://leetcode.com/problems/reverse-string

The Data Structures and Algorithms (DSA) lesson uses a loop approach with pointers to first and last element solve the question.

The first element of the array has to be swapped with the last element.

The second element of the array has to be swapped with the second to last element.

The swapping repeats with the left and right pointers converging to the element in the middle of the array.

Knowing that approach, you can iterate over the elements in the first half of the array.

The index of the right-hand side element that needs to be swapped is given by the formula n - 1 - i.

So, you always swap the i-th element with the (n - 1 - i)-th element.

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.