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re: Advent of Code 2019 Solution Megathread - Day 4: Secure Container VIEW POST

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re: I had to write my own in kotlin! Their design philosophy states that GroupBy->MapValues(Count) is good enough, and I... kind of agree? Still ha...
 

I'd agree that it's not strictly necessary, as (group-by identity "112233") would solve the same problem; however, if you give me a convenience function, I'll take it. :D

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