Archive of all the leetcode problems I've done. All are in Python except one maybe.
Archive of Cracking the Coding Interview problems I've done by chapter.
Various code for some subpar algorithms to compute prime numbers, Mersenne Primes, Collatz iterations, etc. Many of these functions may be used in project euler problems.
Project Euler Practice problems. The problems themselves are owned by Project Euler. Visit projecteuler.net for a list of all problems.
Topcoder practice problems. The problems themselves are property of TopCoder, Inc. I do not in any way own any information in the problem statements. If you're looking for the problem itself, go to arena.topcoder.com, practice problems, and search it by the script name.