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❄ - 2025 DAY 12 SOLUTIONS - ❄
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this post was submitted on 12 Dec 2025
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Advent Of Code
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An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!
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.
Everybody Codes is another collection of programming puzzles with seasonal events.
EC 2025
AoC 2025
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| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 |
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Mild spoilers ahead, but you're reading the solutions thread.
I was just doing some preliminary checking of the data on my phone with Nushell (to see how much my ageing laptop would suffer) when I discovered there weren't any non trivial cases.
Normally I get the test data working before trying the input data, this is definitely teaching me the value of investigating the data before heading down into the code mines.
Unfortunately I can't get the second star yet because I missed a few days.
I actually did a lot of optimizations before I had to give up and search what I was missing. I did have a look at my input data, but still wouldn't make the connection because in my mind, any solution had to work for the sample too.
Yeah, it's quite a mean trick really - kinda a big middle finger to anyone who does TDD