java: add solutions for year 2016, day 24 #117
Merged
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Almost done!
This puzzle was fairly easy, but only since I had year 2019, day 18 (#76) fresh in mind -- the puzzles are fairly similar, but this one is a little bit simpler. As such, I implemented it in more or less the same way as I did for year 2019, day 18. The solution runs fast: about 10 milliseconds on a warmed up JVM for both parts 1 and 2.