Day 11: Cosmic Expansion

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  • @to_urcite_ty_kokosEnglish
    2•1 year ago

    Kotlin

    Github

    Was lazy at the beginning, so I started to do actual expansion in memory, then decided to do it properly. And it paid off in the second part.

    • find galaxy coordinates + hold few bit masks to find unused rows and columns → convert to indexes
    • transform original galaxies coordinates considering number of previous empty lines (time for simple binary search)
    • use the Manhattan distance