In this video, I solve LeetCode Problem 2879, where the challenge is to display the first three rows of a DataFrame using Python’s panda library. I guide you through an efficient and straightforward solution to achieve this, highlighting the use of the “head()” function to extract and view the initial rows of the DataFrame. Whether…
In this video, I solve the LeetCode problem 2881, where we need to add a new ‘bonus ‘column to a DataFrame by doubling the values in the existing ‘salary’ column. Using Python’s pandas library, I walk through the step-by-step process of manipulating the DataFrame to create and populate the new column efficiently.
In this video, I solve the LeetCode problem, “136. Single Number,” where the challenge is to identify the unique element in an array where every other number appears twice. Using a clever bitwise XOR approach, I demonstrate an efficient solution with linear time complexity and constant space. Watch the video to see how XOR-ing all…
In this video, I solved the LeetCode problem “617. Merge Two Binary Trees” using Python. I demonstrate both recursive and approac to merge two binary trees by summing overlapping nodes and preserving non-overlapping ones. This will help you understand the merging process and how to implement it efficiently. Below is the complete code for the…
I solved the LeetCode problem “112. Path Sum” using Python. I walk through a clear and concise solution to determine if there’s a root-to-leaf path in a binary tree that sums up to a specified target value. By implementing a recursive depth-first search approach, I explain how to handle different cases, including empty trees and…
I focus on solving the problem of inserting a value into a Binary Search Tree (BST) using a recursive approach. I provide a clear and concise explanation of how the recursive method navigates the tree to find the correct insertion point while maintaining BST properties. The video walks through the logic and implementation step-by-step. Below…
I solve the LeetCode problem 12, “Integer to Roman,” by demonstrating an efficient solution using Python. I employ a greedy algorithm to convert an integer into its Roman numeral representation. This approach leverages a predefined list of symbol-value pairs, allowing for a straightforward conversion by repeatedly subtracting the largest possible values. Watch the video to…
In this video, I solve the LeetCode problem “101. Symmetric Tree” using both recursive and iterative DFS approaches in Python. I walk through each method to check if a binary tree is symmetric around its center, demonstrating the algorithm’s effectiveness in ensuring mirrored node values and structure. Below is the code used to solve this…
I solved the problem of validating a Binary Search Tree (BST) using Python, as seen in LeetCode problem 98. I walk through the recursive approach to ensure that each node adheres to BST properties by maintaining valid value ranges for both left and right subtrees. This method not only checks that each node’s value falls…
In this video, I tackle the problem of merging k sorted linked-lists into a single sorted linked-list using Python. By leveraging a min-heap (priority queue) from the heapq module, I demonstrate an efficient approach to combine multiple sorted lists into one. This method ensures that the resulting list maintains the sorted order while handling the…
