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I'm surprised no one mentioned PageRank (or maybe I missed it).

Another favorite is RAFT, simply because of how elegant and simple it is and how easy it is to understand.

Also - I used to work in a company that did P2P video streaming (pre WebRTC) and the way the protocol leveraged Reed Solomon Coding was just awesome. https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_cor...

Probably the most commercially successful algorithm ever invented.

Seconding this. Its super easy to understand and explain to others (albeit implementation I have found to be somewhat more challenging when you dig into the details)

Yeah, once you start considering log rewrites I remember it got a bit more challenging. But the main idea is super elegant and beautiful.

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