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I recently got super interested in constraint problems after reading Classical Computer Science Problems in Java. They were really fascinating (along with all the problems in the book).

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Thank you very much for the recommdation, looks like an amazing resource. Hopefully i'll be able to schedule time work through this. Would have loved to study CS but awesome/time consuming events in my life prevented it, which is totally fine.

The author also wrote the book for Python or Swift if you’re not into Java.

Author here... thanks really appreciate the shoutout! The Java version is the most recent and probably the best version if you know multiple of the languages and have to choose between them. The Python and Java versions cover all of the same problems. The Swift version (the oldest) is missing a couple. You can find out more about all three, including links to translations in 9 languages, here: https://classicproblems.com/

Thank you very much for writing it. Lucky me, i'm most proficient in Java even though i used all three. May do it in Kotlin, we'll see. You deserve way more than a shoutout, submitted it <edit> so Pythonistas and Swift developers may discover it too</edit>.

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