Links

 

GeeksforGeeks

 

Lots of good forums and organized topics to learn.

www.geeksforgeeks.org

 

DMOJ

 

Use this website to access old problems and submit your code to be tested.

dmoj.ca

 

Pycharm

 

Free IDE for Python, easy to store and organize code.

www.jetbrains.com/pycharm

 

IntelliJ IDE

 

Free IDE for Java, easy to store and organize code

https://www.jetbrains.com/idea

 

Repl.it

 

Free Browser-Based IDE for Java, Python and other languages

https://repl.it/

 

CEMC

 

Collection of Past University of Waterloo Math and Computing Contests

https://www.cemc.uwaterloo.ca/contests/past_contests.html

 

Code Combat

 

Introduction to coding tutorial in the form of a game

https://codecombat.com/play