Added "on cache" solution #1
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Thanks for the nice blog post. I went through very similar considerations, but then ended up in caching not the call result, but the sum of those results. Or, to say it differently, I ran the algorithm on the cache rather than just caching intermediate results.
For the 75 blinks required for part 2 of Day11 this is faster (by a factor of 2) than the dictionary caching. (Well,
List.groupByalso uses a dictionary internally.)The code is in this PR.