A modern programming language that makes developers happier.

kotlinlang

Same here - started decompiling until I realised part 1 didn't really need it. Then I blindly assumed that part 2 would surely require decompiling, so I stuck with it and implemented the logic in Kotlin.

Only when I saw your remark do I realise it wasn't necessary at all.... Ah well, live and learn!

Code is here: <https://github.com/jorispz/aoc-2018/blob/master/src/commonMain/kotlin/P21.kt>. Timings (first/best of 25 in ms): JVM `209/54`, JS `375/329`, native `3774/3196`