Problems are sortable by difficulty. Code Chef's practice problems allow you to answer in one of over 50 programming languages as you prepare for its internal or external monthly contests.

Mastering the C programming language - a classic code environment used to build software, apps, and whole operating systems - is a great skill, and Mac OS X makes it easy to learn.

HackerRank, a free coding practice website that allows developers to hone their coding skills by solving challenges, launched a University Rankings Competition to figure out which schools produce ...