AoC 2023 Day 3: Gearinator

Source: Day 3: Gear Ratios

Part 1

Take as input a 2D grid of numbers or symbols (. represents empty space). Numbers will be 1 or more digits written horizontally which should be concatenated (.467* is the number 467 followed by the symbol *).

Sum all numbers that are adjacent (including diagonally) to at least one symbol.

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AoC 2023 Day 2: Playinator

Source: Day 2: Cube Conundrum

Part 1

Play a game where you have some number of red, green, and blue dice in a cup, which you draw and roll (without replacement). Which game is possible with only 12 red, 13 gree, and 14 blue cubes?

Input will look like: Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green

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Advent of Code 2023

Another year, another Advent of Code.

Like last year, we’re doing Rust. I’ve really grown to love the language since last year… and hopefully I’ve learned a bit more about how to write more ‘proper’ Rust. I know I had some issues last year. Functional… but it could be better.

Let’s see how it goes!

For full solutions, as always, I post to GitHub (including previous years and possibly some I haven’t written up yet): jpverkamp/advent-of-code

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AoC 2022 Day 23: Elf Scattinator

Source: Unstable Diffusion

Part 1

Implement a cellular automaton with the following rules:

  • If you have no neighbors, don’t move (important, I forgot this one for a while)
  • Otherwise:
    • Calculate a potential move:
      • If you have no neighbors to the north, move north
      • If not, check likewise for south, then west, than east
    • If no other agent is moving to the same space, move to your potential move
    • Otherwise, don’t move
  • On each frame, rotate the order the directions are checked in (NSWE, SWEN, WENS, ENSW, NSWE, …)

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AoC 2022 Day 22: Wonderator

Source: Monkey Map

Part 1

Given a map and a series of instructions formatted as distance + turn (L or R), find the final position. Any time you would walk off the edge of the map, wrap to the opposite edge.

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