Day 5: If You Give a Seed a Fertilizer

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  • cacheson
    2•7 months ago

    Treated each range as an object, and used set operations on them

    That’s smart. Honestly, I don’t understand how it works. 😅

    “Set operations” should probably be in quotes. I just mean that I implemented the * (intersection) and - (difference) operators for my ValueRange type. The intersection operator works like it does for sets, just returning the overlap. The difference operator has to work a little differently, because ranges have to be contiguous, whereas sets don’t, so it returns a sequence of ValueRange objects.

    My ValueMapping type uses a ValueRange for it’s source, so applying it to a range just involves using the intersection operator to determine what part of the range needs to move, and the difference operator to determine which parts are left.

    • janAkaliEnglish
      1•7 months ago

      Well, then we have the same solution but coded very differently. Here’s mine.

      ruleApplied is one function with almost all logic. I take a range and compare it to a rule’s source range (50 98 2 is a rule). Overlaps get transformed and collected into the first sequence and everything that left goes in the second. I need two seqs there, for transformed values to skip next rules in the same map.

      Repeat for each rule and each map (seq[Rule]). And presto, it’s working!

      • cacheson
        2•7 months ago

        Yeah, roughly the same idea. I guess I could have just used HSlice for my range type, I thought maybe there was some special magic to it.

        It looks like your if-else ladder misses a corner case, where one range only intersects with the first or last element of the other. Switching to <= and >= for those should take care of it though.