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Re:Tic-Tac-Toe Implemented in Single Call to Printf() by jedimastert on Friday June 05, 2020 @01:03PM (#23430772)
The author originally wrote a paper provin that printf is Turing Complete [0].

Here is program itself and an actual, excellent write up [1].

@dang, you might consider switching the link to the GitHub. I don't think the Hackaday article actually adds anything new.

[0]: https://www.usenix.org/system/files/conference/usenixsecurit...

[1]: https://github.com/carlini/printf-tac-toe

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