Advent of Code 2021 day 09

• adventofcode

  718 65 9.0 Scala

  Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)

• aoc2021

  2 0 0.0 Haskell

  AoC 2021 (by pwm)

• InfluxDB

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• aoc-2021

  14 1 0.0 Haskell

  AOC challenge in Haskell (by giacomocavalieri)

Here's my solution, I really liked today's challenge. After solving part 2 I rewrote part 1 to use the same code that finds the basins. The code turned out to be very useful and the final solution is quite nice and succint.

• aoc-hs

  1 2 7.5 Haskell

  Solutions to advent of code exercises in Haskell.

After a few false starts I found grid and it's so well-suited for the problem that the solution ended up being really elegant, IMO. The full solution is here but the meat of it is this function that turns a rectangular grid of squares mapped to Int into a grid of the same shape to Maybe (Point, Int). The value this function returns just needs some sorting, groupBy, and catMaybe.

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