500+ Data Structures and Algorithms Practice Problems (medium.com)

This is just a spam list of links.

If you want to practice programming problems, try

1) https://projecteuler.net/archives (625 problems)

2) https://uva.onlinejudge.org/index.php?option=com_onlinejudge... (1800 problems)

3) https://www.topcoder.com/tc?module=ProblemArchive