Free Resources For Competitive Programming

1.HackerRank:

HackerRank: is a place where programmers from all over the world come together to solve problems in a wide range of Computer Science domains such as algorithms, machine learning, or artificial intelligence, as well as to practice different programming paradigms like functional programming.

2.FreeCodeCamp:

FreeCodeCamp 

is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone.

3.CODEFORCES:

CodeForces:Codeforces is a website that hosts competitive programming contests. It is maintained by a group of competitive programmers from ITMO University led by Mikhail Mirzayanov. Since 2013, Codeforces claims to surpass Topcoder in terms of active contestants. As of 2018, it has over 600,000 registered users.

4.GeeksforGeeks:

GeeksforGeeks.org was created with a goal in mind to provide well written, well thought and well explained solutions for selected questions. ... Whether you want to learn algorithms, data structures or it is the programming language on its own which interests you, GeeksforGeeks has covered everything!

5.CodeChef:

CodeChef is a competitive programming website. It is a non-profit educational initiative of Unacademy, aimed at providing a platform for students, young software professionals to practice