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Spoj - Sphere Online Judge created for the coders' community to train, to learn and to make progress.
Rosetta Code - Rosetta Code is a programming resource that provides example problems of how to write the same...
99 Interview - 99Interview provide you the platform to prepare the interview before facing the real interview panel.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
The AI Games - Challenge people worldwide by coding bots in awesome games.
Remoteinterview - Remote Interview offers online programming screening tests.