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You could have invented Fenwick trees

(www.cambridge.org)
131 points matt_d | 1 comments | 25 Jan 25 00:23 UTC | HN request time: 0.285s | source
1. nayuki ◴[25 Jan 25 05:14 UTC] No.42819693[source]▶
When making my implementation, the math felt unintuitive. https://www.nayuki.io/page/binary-indexed-tree