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ZXC is a lossless compression C library for write-once, read-many data. It decodes faster than LZ4 at a smaller size, with seekable archives, dictionaries and SIMD on ARM and x86.
An aggregation is some kind of summary of a set of data. This can be the sum, length, minimum, etc. It is quite common to want to calculate such a summary repeatedly, e.g. “the maximum noise level in dB for the past 30 seconds” for a nuisance detector.
This post describes the construction of an Aho-Corasick automaton for the simultaneous matching of substrings within a sequence. I’m fond of this algorithm because it constructs an automaton from an existing tree data structure in a rather pleasant way.
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