Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2024

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🤖 - 2024 DAY 24 SOLUTIONS - 🤖 (programming.dev)

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

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Day 24: Crossed Wires

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[–] [email protected] 2 points 1 week ago

Rust + Pen and Paper

Yikers. Part 2 took a while, staring at this diagram for hours. Eventually I noticed that each of these blocks has two pairs of (XOR, AND) gates sharing the same inputs (and inputs aren't changed). So I matched up these pairs based on a distance metric of how much needs to be swapped to fit together. This helped me identify 4 blocks with errors, the rest was solved using pen and paper (one block is missing as it became apparent at that point):

shaky diagrams for full adder with wrong outputs

There is also some code, but do yourself and me a favor and don't look at it. While it does turn up the correct solution, it probably won't with any other input, especially not the examples.