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What does this PR do?
This Pull Request addresses the broken link in Problem Sets and Competitive Programming (problem-sets-competitive-programming.md) from issues EbookFoundation#6942 and EbookFoundation#7306. The original link is of A2 Online Judge is broken. However, there is an alternative website that contains its static pages/ladders.
https://a2oj.com/ -> https://a2oj.netlify.app/
For resources
Description
Why is this valuable (or not)?
This PR is valuable because it will assist programmers in finding an alternative to A2OJ, which has been permanently closed by its owners.
How do we know it's really free?
For book lists, is it a book? For course lists, is it a course? etc.
Checklist:
Follow-up