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VisuAlgo was conceptualised in 2011 by Dr Steven Halim as a tool to help his students better understand data structures and algorithms, by allowing them to learn the basics on their own and at their own pace. Together with his students from the National University of Singapore, a series of visualizations were developed and consolidated, from simple sorting algorithms to complex graph data structures. Though specifically designed for the use of NUS students taking various data structure and algorithm classes (CS1010/equivalent, CS2040/equivalent, CS3230, CS3233, and CS4234), as advocators of online learning, we hope that curious minds around the world will find these visualizations useful as well.

https://visualgo.net

• https://visualgo.net/en/hashtable

Run code live in your browser. Write and run code in 50+ languages online with Replit, a powerful IDE, compiler, & interpreter.

https://replit.com/

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).

https://regexr.com/

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

https://www.geeksforgeeks.org/

• https://www.geeksforgeeks.org/merging-intervals/ some interesting example