Number of Good Pairs (LeetCode 1512) | Full solution with visuals and examples | Study Algorithms

Given an array, we need to find the number of good pairs that can be formed with the elements. A pair is said to be good if the elements are same and the left index is smaller than the right index. Watch the video to see a visual example of how the pairs are determined. The video also explores a progressive way to arrive at an optimal solution along with a dry-run of the code. Simple maths can be wonderful at times.

Chapters:
00:00 - Intro
01:11 - Problem statement and description
04:54 - Brute Force approach to find good pairs
07:09 - Efficient method to find good pairs
10:52 - Dry-run of Code
12:53 - Final Thoughts

Actual problem on LeetCode: https://leetcode.com/problems/number-...

📚 Links to topics I talk about in the video:
Brute Force Method:    • Brute Force algorithms with real life exam...  
Counting Sort:    • Counting Sort explained with animations an...  
Bucket Sort:    • Bucket Sort explained with animations and ...  
What is Big O?:    • Big O Notation Simplified to the MAX | Stu...  
Other LeetCode questions:    • Leetcode Solutions  

📘 A text based explanation is available at: https://studyalgorithms.com

Code on Github: https://github.com/nikoo28/java-solut...
Test-cases on Github: https://github.com/nikoo28/java-solut...

📖 Reference Books:
Starting Learn to Code: https://amzn.to/36pU0JO
Favorite book to understand algorithms: https://amzn.to/39w3YLS
Favorite book for data structures: https://amzn.to/3oAVBTk
Get started for interview preparation: https://amzn.to/39ysbkJ

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