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Dec 7, 2025
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feat: 2025 day 7 #11

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15 changes: 15 additions & 0 deletions .src/2025_desc.txt
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Expand Up @@ -90,3 +90,18 @@ Read the input one way to add and multiply various numbers.
#### Part 2

Read the input in a different way to add and multiply various numbers.
-- Day 7
Splitting tachyon manifolds

### Description

#### Part 1

The input is a map with the positions of the splitters and the starting tachyon.
We should determine how many times the tachyon splits, while travelling in a
*classical* tachyon manifold.

#### Part 2

For part 2, we should determine how many times the tachyon splits, while travelling in a
*quantum* tachyon manifold.
1 change: 1 addition & 0 deletions Advents.lean
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Expand Up @@ -5,3 +5,4 @@ import Advents.AoC2025.day03
import Advents.AoC2025.day04
import Advents.AoC2025.day05
import Advents.AoC2025.day06
import Advents.AoC2025.day07
1 change: 1 addition & 0 deletions Advents/AoC2025/2025_descriptions.md
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Expand Up @@ -6,3 +6,4 @@
| [4](2025_descriptions_with_tests.md#day-4) | The input is a grid with the positions of rolls of paper. |
| [5](2025_descriptions_with_tests.md#day-5) | Finding fresh ingredients for the cafeteria |
| [6](2025_descriptions_with_tests.md#day-6) | Helping cephalopods with their maths homework |
| [7](2025_descriptions_with_tests.md#day-7) | Splitting tachyon manifolds |
42 changes: 42 additions & 0 deletions Advents/AoC2025/2025_descriptions_with_tests.md
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Expand Up @@ -196,3 +196,45 @@ Read the input in a different way to add and multiply various numbers.
[Solution in Lean](day06.lean)

---

# [Day 7](https://adventofcode.com/2025/day/7)

Splitting tachyon manifolds

#### Test

<pre>
.......S.......
...............
.......^.......
...............
......^.^......
...............
.....^.^.^.....
...............
....^.^...^....
...............
...^.^...^.^...
...............
..^...^.....^..
...............
.^.^.^.^.^...^.
...............
</pre>

### Description

#### Part 1

The input is a map with the positions of the splitters and the starting tachyon.
We should determine how many times the tachyon splits, while travelling in a
*classical* tachyon manifold.

#### Part 2

For part 2, we should determine how many times the tachyon splits, while travelling in a
*quantum* tachyon manifold.

[Solution in Lean](day07.lean)

---
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