Video Tutorials


Video tutorials have the list of the videos that provide the solutions and explanations for most asked Java coding interview questions from Google, Amazon and Facebook etc. You can also watch them in my YouTube channel. If you have a request for making a video tutorial for any particular question or topic, please contact us.

resize image feature

5 ways reduce image size to speed up website

Introduction When traveling, most people take picture using the smart phone. The pictures’ dimensions are 3600 x 2400 pixels or ...
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adapt COVID-19

Adapting to change in the time of COVID -19

I haven’t made videos for more than a year. I am determined to make this video different. This is the ...
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build hierarchy tree tutorial

Build hierarchy tree tutorial

Backstory: Build hierarchy tree tutorial teaches how to build a hierarchy tree from the employee list and their manager ids ...
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shortest path using Dijkstra tutorial

Find shortest and 2nd shortest path using Dijkstra tutorial

Backstory: Find shortest and 2nd shortest path using Dijkstra tutorial extends the use of Dijkstra algorithm, and solve find the ...
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Find k closest points to center tutorial

Find K closest points to center tutorial

Backstory: Find K closest points to center tutorial explains how to use PriorityQueue to solve the question. There are multiple ...
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Shortest path in matrix tutorial

Shortest path in matrix tutorial

Backstory: A matrix is a 2D array, an extension of an array. Meanwhile, matrix is one of the representation of ...
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distinct palindromic substrings suffix trie tutorial

Find distinct palindromic substrings with suffix trie tutorial

Backstory: Find distinct palindromic substrings using suffix trie is one of the Amazon interview question. The tutorial gives a solution ...
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Convert prefix to postfix tutorial

Convert prefix to postfix tutorial

Backstory: Convert prefix to postfix tutorial provides 2 solutions to convert – stack and recursion. The binary tree traversal in ...
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Count occurrence in sorted array tutorial

Find occurrences using binary search tutorial

Backstory: Find occurrences using binary search tutorial introduces binary search, which can improve the complexity significantly in sorted array questions ...
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