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A terrific teardown of tracking down an unexpected O(n^2): https://randomascii.wordpress.com/2021/02/16/arranging-invis...

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The "accidentally quadratic" blog collected such things. Not sure if it's still being updated since Tumblr's mass exodus (the posts don't seem to show timestamps) https://accidentallyquadratic.tumblr.com

Last post was made in 2019. (If you click on the name of the post it shows the timestamp at the bottom)

Blog author stated on Reddit in 2021 that he wasn't maintaining it anymore[0].

[0] https://old.reddit.com/r/programming/comments/jdylxs/acciden...

Also reminds me of the GTA online case.

https://news.ycombinator.com/item?id=26296339

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