HackerEarth
Practice coding problems and join contests and hiring challenges
HackerEarth has practice problems and coding challenges for developers. You pick a problem in basic programming, data structures, algorithms or math, write a solution in the browser editor, and submit it to be scored on test cases. The challenges section lists competitive contests, hackathons and hiring challenges run by companies.
Free · Login needed · Browser · Intermediate
About HackerEarth
The practice tracks start simple and get harder, so it works for students who want regular drills before job interviews. Hiring challenges can also put you in touch with employers.
You use it in the browser, and you need an account to submit. The main home page now focuses on hiring tools for businesses, so go straight to the practice or challenges pages.