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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StackLang Part II: The Lexer

StackLang, part 2: lexing.

It’s quite often the simplest part of implementing a programming language (although parsers for s-expression based languages come close), but it’s still something that needs done. So here we go!

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StackLang Part I: The Idea

I enjoy writing programming languages. Example: Tiny. Let’s do that again.

This time, StackLang:

{
  @[n fact]
  1
  { n 1 - $fact fact n * }
  N 1 <= if
} @fact

5 $fact fact writeln

Bit of gibberish there, I suppose, but the goal is to write everything in a postfix/stack based model. So n 1 - $fact fact n * is equivalent to fact(fact, n - 1) * n in a more traditional language.

Over the next few posts, I hope to write up where I am thus far and what’s next.

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