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The official awful.systems Advent of Code 2023 thread (awful.systems)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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Rules: no spoilers.

The other rules are made up as we go along.

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[–] [email protected] 3 points 1 year ago

Here's where I landed in dart

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d9(bool s) {
  print(getLines().fold(0, (p, e) {
    int pre(List h, bool s) {
      return h.every((e) => e == 0)
          ? 0
          : (pre(List.generate(h.length - 1, (i) => h[i + 1] - h[i]), s)) *
                  (s ? -1 : 1) +
              (s ? h.first : h.last);
    }

    return p + pre(stois(e), s);
  }));
}