Comment Comment by 10-6 Coding/Math:https://coderbyte.comhttps://hackerrank.comhttps://leetcode.comhttps://codeforces.comhttps://projecteuler.net (more mathy)https://www.topcoder.com/challengeshttps://adventofcode.comhttps://halite.io (machine learning + game)https://www.enki.com (coding challenges on mobile) parent 10-6 8 years ago
https://coderbyte.com
https://hackerrank.com
https://leetcode.com
https://codeforces.com
https://projecteuler.net (more mathy)
https://www.topcoder.com/challenges
https://adventofcode.com
https://halite.io (machine learning + game)
https://www.enki.com (coding challenges on mobile)