It was fun trying to speed up Part 2 of Day 6. I'm down to about 57ms (in c#) but stuck for ideas for now...!

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Day 3

I like the speed of the GeneratedRegex source code generators in .net :-)

Part1: 130.9 us. (502.72 KB)
Part2: 125.5 us. (476.02 KB)

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I was pleased to be able to use C#'s SearchValues and SplitAny functions in Day 1 of Advent of Code.

:-)

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