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Re:GitHub repository for Sedgewick's Algorithms is taken down by airstrike on Saturday May 01, 2021 @09:20AM (#27006083)
If you're just looking for the algorithms, there's always this C# port (from 7 years ago): https://github.com/angellaa/algs4

Interestingly, the README includes an e-mail exchange with Kevin, who noted the code is GPL

Re:GitHub repository for Sedgewick's Algorithms is taken down by gravypod on Saturday May 01, 2021 @08:14PM (#27011170)
It looks like the original code is located here: https://algs4.cs.princeton.edu/code/

Found this in the link you provided. As you can see from the code there is a GPL license footer on each file.

Re:GitHub repository for Sedgewick's Algorithms is taken down by valkum on Sunday May 02, 2021 @07:19AM (#27014207)
This site even links to the now taken down Git repo.