Holy shit: https://www.wired.com/story/undergraduate-upends-a-40-year-old-data-science-conjecture/
For the non-programmers: hash tables are one of those things you learn about in your first year as a CS student, and very likely in your first CS class. Not something you expect to read about conjecture-breaking, complexity-bounds-changing new implementations of.
Full paper: https://arxiv.org/abs/2501.02305
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