# LeetCode

## Sum of Unique Elements | LeetCode 1748 | Python | Solution

Click here to see the problem details. Problem Overview This one is a very much simple problem. We have to find out the sum of all...

## Reverse Only Letters | LeetCode 917 | Python | Solution

Click here to see the problem details. Problem Overview The problem description is pretty precise. It says that we have to return the reverse version of...

## Range Sum of BST | LeetCode 938 | Python | Solution

Click here to see the problem on LeetCode. A simple Tree related problem and description is pretty straightforward. We have to return the sum of values...

## Binary Tree Preorder Traversal | LeetCode 144 | Python | Solution

Click here to see the problem on LeetCode. The problem description is pretty straightforward. We have to return all the nodes’ values following the preorder traversal...

## Monotonic Array | LeetCode 896 | Python | Solution

Here is the link to the problem. See the problem description. We have to check the given array is monotonic or not. What is a monotonic...

## Duplicate Emails | LeetCode 182 | SQL | Solution

This one is a simple SQL problem. Here is the link to this problem. This one is an absolute beginner type problem. We have to query...

## Contains Duplicate | LeetCode 217 | Python | Solution

Click here to see the problem details. The problem is simple. We have to find at least one duplicate in the given array. If we found...

## Reverse String | LeetCode 344 | Python | Solution

Click here to see the problem. And read the description and try to understand the problem first. Reverse String is one of the most common problems...