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What’s the most valuable piece of code, line-for-line, ever produced?

I'd vouch for Viterbi's Algorithm...created Qualcomm, wireless networks broadly, bioinformatics, etc

In motion - complex systems, computing and communication (amongst other things) | msweet.net | working on /subset

I'd vouch for Viterbi's Algorithm...created Qualcomm, wireless networks broadly, bioinformatics, etc https://en.wikipedia.org/wiki/Viterbi_algorithm

Software Engineer @ Cadence Design Systems. B4: Stanford EE / Illinois ECE

Yes, in fact, I speculate that Blockchain tracking firms like Chainalysis are using Viterbi & HMMs to create probabilities of who is using Tornado cash, etc.
It's culmination of Claude Shannon's information theory applied through engineering.

Ooo cool! Impressive generality. Still in wide use today? A foundational method rather than state of the art?