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2025: day 12
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‎README.md‎

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@@ -1,7 +1,7 @@
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# [Advent of Code](https://adventofcode.com) in Rust 🦀
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![Stars: 522](https://img.shields.io/badge/Stars-522⭐-blue)
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![Rust: 261](https://img.shields.io/badge/Rust-261-cyan?logo=Rust)
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![Stars: 524](https://img.shields.io/badge/Stars-524⭐-blue)
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![Rust: 262](https://img.shields.io/badge/Rust-262-cyan?logo=Rust)
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![Python: 127](https://img.shields.io/badge/Python-127-cyan?logo=Python)
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<img src="./scripts/assets/christmas_ferris_2015_2024.png" alt="Christmas Ferris" width="164" />
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Made for fun 😎 and to practice Rust. Many thanks to [Eric Wastl](https://twitter.com/ericwastl).
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## 2025 (current event) ([Calendar](https://adventofcode.com/2025)) ([Solutions](src/year2025/)) : 22⭐
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Puzzle | Stars | Languages
16-
----------------------------------------------------------------- | ----- | -----------
17-
[Day 1: Secret Entrance](https://adventofcode.com/2025/day/1) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day1/day1.rs) [![Python](./scripts/assets/python.png)](src/year2025/day1/day1.py) [![C](./scripts/assets/c.png)](src/year2025/day1/day1.c) [![Go](./scripts/assets/go.png)](src/year2025/day1/day1.go)
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[Day 2: Gift Shop](https://adventofcode.com/2025/day/2) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day2/day2.rs) [![Python](./scripts/assets/python.png)](src/year2025/day2/day2.py) [![Go](./scripts/assets/go.png)](src/year2025/day2/day2.go)
19-
[Day 3: Lobby](https://adventofcode.com/2025/day/3) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day3/day3.rs) [![Python](./scripts/assets/python.png)](src/year2025/day3/day3.py) [![Go](./scripts/assets/go.png)](src/year2025/day3/day3.go)
20-
[Day 4: Printing Department](https://adventofcode.com/2025/day/4) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day4/day4.rs) [![Python](./scripts/assets/python.png)](src/year2025/day4/day4.py) [![Go](./scripts/assets/go.png)](src/year2025/day4/day4.go)
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[Day 5: Cafeteria](https://adventofcode.com/2025/day/5) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day5/day5.rs) [![Go](./scripts/assets/go.png)](src/year2025/day5/day5.go)
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[Day 6: Trash Compactor](https://adventofcode.com/2025/day/6) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day6/day6.rs) [![Rust](./scripts/assets/rust.png)](src/year2025/day6/day6_declarative.rs) [![Python](./scripts/assets/python.png)](src/year2025/day6/day6.py)
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[Day 7: Laboratories](https://adventofcode.com/2025/day/7) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day7/day7.rs) [![Go](./scripts/assets/go.png)](src/year2025/day7/day7.go) [🎁](src/year2025/day7/README.md)
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[Day 8: Playground](https://adventofcode.com/2025/day/8) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day8/day8.rs)
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[Day 9: Movie Theater](https://adventofcode.com/2025/day/9) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day9/day9.rs) [![Rust](./scripts/assets/rust.png)](src/year2025/day9/day9_geo.rs) [![Python](./scripts/assets/python.png)](src/year2025/day9/day9_img.py) [🎁](src/year2025/day9/README.md)
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[Day 10: Factory](https://adventofcode.com/2025/day/10) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day10/day10.rs)
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[Day 11: Reactor](https://adventofcode.com/2025/day/11) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day11/day11.rs)
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## 2025 (current event) ([Calendar](https://adventofcode.com/2025)) ([Solutions](src/year2025/)) : 24⭐
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Puzzle | Stars | Languages
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------------------------------------------------------------------- | ----- | -----------
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[Day 1: Secret Entrance](https://adventofcode.com/2025/day/1) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day1/day1.rs) [![Python](./scripts/assets/python.png)](src/year2025/day1/day1.py) [![C](./scripts/assets/c.png)](src/year2025/day1/day1.c) [![Go](./scripts/assets/go.png)](src/year2025/day1/day1.go)
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[Day 2: Gift Shop](https://adventofcode.com/2025/day/2) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day2/day2.rs) [![Python](./scripts/assets/python.png)](src/year2025/day2/day2.py) [![Go](./scripts/assets/go.png)](src/year2025/day2/day2.go)
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[Day 3: Lobby](https://adventofcode.com/2025/day/3) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day3/day3.rs) [![Python](./scripts/assets/python.png)](src/year2025/day3/day3.py) [![Go](./scripts/assets/go.png)](src/year2025/day3/day3.go)
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[Day 4: Printing Department](https://adventofcode.com/2025/day/4) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day4/day4.rs) [![Python](./scripts/assets/python.png)](src/year2025/day4/day4.py) [![Go](./scripts/assets/go.png)](src/year2025/day4/day4.go)
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[Day 5: Cafeteria](https://adventofcode.com/2025/day/5) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day5/day5.rs) [![Go](./scripts/assets/go.png)](src/year2025/day5/day5.go)
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[Day 6: Trash Compactor](https://adventofcode.com/2025/day/6) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day6/day6.rs) [![Rust](./scripts/assets/rust.png)](src/year2025/day6/day6_declarative.rs) [![Python](./scripts/assets/python.png)](src/year2025/day6/day6.py)
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[Day 7: Laboratories](https://adventofcode.com/2025/day/7) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day7/day7.rs) [![Go](./scripts/assets/go.png)](src/year2025/day7/day7.go) [🎁](src/year2025/day7/README.md)
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[Day 8: Playground](https://adventofcode.com/2025/day/8) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day8/day8.rs)
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[Day 9: Movie Theater](https://adventofcode.com/2025/day/9) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day9/day9.rs) [![Rust](./scripts/assets/rust.png)](src/year2025/day9/day9_geo.rs) [![Python](./scripts/assets/python.png)](src/year2025/day9/day9_img.py) [🎁](src/year2025/day9/README.md)
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[Day 10: Factory](https://adventofcode.com/2025/day/10) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day10/day10.rs)
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[Day 11: Reactor](https://adventofcode.com/2025/day/11) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day11/day11.rs)
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[Day 12: Christmas Tree Farm](https://adventofcode.com/2025/day/12) | ⭐⭐ | [![Rust](./scripts/assets/rust.png)](src/year2025/day12/day12.rs)
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## All years
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Calendar | Solutions | Stars | Rust | Python | 🎁
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-------- | --------- | ----- | ---- | ------ | --
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[Advent of Code 2025](https://adventofcode.com/2025) | [Solutions](src/year2025/README.md) | 22⭐ | 11 | 5 | 2
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[Advent of Code 2025](https://adventofcode.com/2025) | [Solutions](src/year2025/README.md) | 24⭐ | 12 | 5 | 2
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[Advent of Code 2024](https://adventofcode.com/2024) | [Solutions](src/year2024/README.md) | 50⭐ | 25 | 11 | 3
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[Advent of Code 2023](https://adventofcode.com/2023) | [Solutions](src/year2023/README.md) | 50⭐ | 25 | 10 | 2
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[Advent of Code 2022](https://adventofcode.com/2022) | [Solutions](src/year2022/README.md) | 50⭐ | 25 | 18 | 1

‎scripts/runall.py‎

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return puzzles
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def aoc_nb_answers(year: int, day: int) -> int:
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if year < 2025:
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if day == 25:
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return 1
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if 1 <= day <= 24:
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return 2
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return 0
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else:
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if day == 12:
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return 1
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if 1 <= day <= 11:
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return 2
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return 0
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class Env:
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"""
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Variables that can be overridden by environment variables.
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timing_status = "☽" if in_cache else " "
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if (not in_cache and not dry_run) or refresh:
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nb_expected = 1 if day == 25 else 2
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nb_expected = aoc_nb_answers(year, day)
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cached_e = e
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‎src/lib.rs‎

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);
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make_year!(year2025
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day1,day2,day3,day4,day5,day6,day7,day8,day9,day10,day11
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day1,day2,day3,day4,day5,day6,day7,day8,day9,day10,day11,day12
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);

‎src/year2025/README.md‎

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# Advent of Code in Rust 🦀
22

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![AoC2025](https://img.shields.io/badge/Advent_of_Code-2025-8A2BE2)
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![Stars: 22](https://img.shields.io/badge/Stars-22⭐-blue)
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![Rust: 13](https://img.shields.io/badge/Rust-13-cyan?logo=Rust)
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![Stars: 24](https://img.shields.io/badge/Stars-24⭐-blue)
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![Rust: 14](https://img.shields.io/badge/Rust-14-cyan?logo=Rust)
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![Python: 6](https://img.shields.io/badge/Python-6-cyan?logo=Python)
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## 2025 ([Calendar](https://adventofcode.com/2025)) ([Solutions](./)) : 22⭐
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## 2025 ([Calendar](https://adventofcode.com/2025)) ([Solutions](./)) : 24⭐
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Puzzle | Stars | Languages
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----------------------------------------------------------------- | ----- | -----------
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[Day 1: Secret Entrance](https://adventofcode.com/2025/day/1) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day1/day1.rs) [![Python](../../scripts/assets/python.png)](day1/day1.py) [![C](../../scripts/assets/c.png)](day1/day1.c) [![Go](../../scripts/assets/go.png)](day1/day1.go)
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[Day 2: Gift Shop](https://adventofcode.com/2025/day/2) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day2/day2.rs) [![Python](../../scripts/assets/python.png)](day2/day2.py) [![Go](../../scripts/assets/go.png)](day2/day2.go)
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[Day 3: Lobby](https://adventofcode.com/2025/day/3) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day3/day3.rs) [![Python](../../scripts/assets/python.png)](day3/day3.py) [![Go](../../scripts/assets/go.png)](day3/day3.go)
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[Day 4: Printing Department](https://adventofcode.com/2025/day/4) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day4/day4.rs) [![Python](../../scripts/assets/python.png)](day4/day4.py) [![Go](../../scripts/assets/go.png)](day4/day4.go)
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[Day 5: Cafeteria](https://adventofcode.com/2025/day/5) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day5/day5.rs) [![Go](../../scripts/assets/go.png)](day5/day5.go)
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[Day 6: Trash Compactor](https://adventofcode.com/2025/day/6) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day6/day6.rs) [![Rust](../../scripts/assets/rust.png)](day6/day6_declarative.rs) [![Python](../../scripts/assets/python.png)](day6/day6.py)
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[Day 7: Laboratories](https://adventofcode.com/2025/day/7) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day7/day7.rs) [![Go](../../scripts/assets/go.png)](day7/day7.go) [🎁](day7/README.md)
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[Day 8: Playground](https://adventofcode.com/2025/day/8) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day8/day8.rs)
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[Day 9: Movie Theater](https://adventofcode.com/2025/day/9) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day9/day9.rs) [![Rust](../../scripts/assets/rust.png)](day9/day9_geo.rs) [![Python](../../scripts/assets/python.png)](day9/day9_img.py) [🎁](day9/README.md)
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[Day 10: Factory](https://adventofcode.com/2025/day/10) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day10/day10.rs)
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[Day 11: Reactor](https://adventofcode.com/2025/day/11) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day11/day11.rs)
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Puzzle | Stars | Languages
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------------------------------------------------------------------- | ----- | -----------
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[Day 1: Secret Entrance](https://adventofcode.com/2025/day/1) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day1/day1.rs) [![Python](../../scripts/assets/python.png)](day1/day1.py) [![C](../../scripts/assets/c.png)](day1/day1.c) [![Go](../../scripts/assets/go.png)](day1/day1.go)
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[Day 2: Gift Shop](https://adventofcode.com/2025/day/2) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day2/day2.rs) [![Python](../../scripts/assets/python.png)](day2/day2.py) [![Go](../../scripts/assets/go.png)](day2/day2.go)
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[Day 3: Lobby](https://adventofcode.com/2025/day/3) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day3/day3.rs) [![Python](../../scripts/assets/python.png)](day3/day3.py) [![Go](../../scripts/assets/go.png)](day3/day3.go)
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[Day 4: Printing Department](https://adventofcode.com/2025/day/4) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day4/day4.rs) [![Python](../../scripts/assets/python.png)](day4/day4.py) [![Go](../../scripts/assets/go.png)](day4/day4.go)
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[Day 5: Cafeteria](https://adventofcode.com/2025/day/5) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day5/day5.rs) [![Go](../../scripts/assets/go.png)](day5/day5.go)
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[Day 6: Trash Compactor](https://adventofcode.com/2025/day/6) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day6/day6.rs) [![Rust](../../scripts/assets/rust.png)](day6/day6_declarative.rs) [![Python](../../scripts/assets/python.png)](day6/day6.py)
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[Day 7: Laboratories](https://adventofcode.com/2025/day/7) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day7/day7.rs) [![Go](../../scripts/assets/go.png)](day7/day7.go) [🎁](day7/README.md)
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[Day 8: Playground](https://adventofcode.com/2025/day/8) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day8/day8.rs)
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[Day 9: Movie Theater](https://adventofcode.com/2025/day/9) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day9/day9.rs) [![Rust](../../scripts/assets/rust.png)](day9/day9_geo.rs) [![Python](../../scripts/assets/python.png)](day9/day9_img.py) [🎁](day9/README.md)
21+
[Day 10: Factory](https://adventofcode.com/2025/day/10) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day10/day10.rs)
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[Day 11: Reactor](https://adventofcode.com/2025/day/11) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day11/day11.rs)
23+
[Day 12: Christmas Tree Farm](https://adventofcode.com/2025/day/12) | ⭐⭐ | [![Rust](../../scripts/assets/rust.png)](day12/day12.rs)

‎src/year2025/day12/day12.rs‎

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//! [Day 12: Christmas Tree Farm](https://adventofcode.com/2025/day/12)
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/// # Panics
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#[must_use]
5+
pub fn solve(data: &str) -> (usize, aoc::Christmas) {
6+
let part1 = data
7+
.split("\n\n")
8+
.map(|s| {
9+
if s.contains('x') {
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s.lines()
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.map(|line| {
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let (size, counts) = line.split_once(": ").unwrap();
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let (width, height) = size.split_once('x').unwrap();
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let size: usize =
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width.parse::<usize>().unwrap() * height.parse::<usize>().unwrap();
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usize::from(
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size >= 9 * counts
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.split_ascii_whitespace()
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.map(|s| s.parse::<usize>().unwrap())
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.sum::<usize>(),
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)
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})
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.sum()
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} else {
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0
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}
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})
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.sum();
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(part1, aoc::CHRISTMAS)
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}
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pub fn main() {
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let args = aoc::parse_args();
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args.run(solve);
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}
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#[cfg(test)]
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mod test {
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use super::*;
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const TEST_INPUT: &str = include_str!("test.txt");
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#[test]
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fn part1() {
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let (part1, _) = solve(TEST_INPUT);
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assert_ne!(part1, 0); // dummy solver does not work for test input
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// assert_eq!(part1, 3);
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}
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}

‎src/year2025/day12/test.txt‎

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0:
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###
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##.
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##.
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1:
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###
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##.
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.##
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2:
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.##
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###
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##.
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3:
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##.
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###
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##.
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###
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#..
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###
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5:
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###
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.#.
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###
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4x4: 0 0 0 0 2 0
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12x5: 1 0 1 0 2 2
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12x5: 1 0 1 0 3 2

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