Solve 2025 day 4#55
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Strings are iterable as well :-)
This reverts commit 3484a51 :-(
Actually, we don't need to save previous versions of the grid.
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Pull request overview
Adds Python solutions for Advent of Code 2025 Day 4 (parts 1 and 2) under the puzzles/solutions/2025/d04/ directory, following the repo’s per-day/per-part script layout.
Changes:
- Introduces Part 1 solution that parses the grid and counts “accessible” paper rolls based on adjacent-roll constraints.
- Introduces Part 2 solution that repeatedly finds accessible rolls, removes them from the grid, and totals all removed rolls across iterations.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| puzzles/solutions/2025/d04/p1.py | Implements grid parsing + adjacency counting and computes Part 1 answer. |
| puzzles/solutions/2025/d04/p2.py | Implements iterative removal loop on top of Part 1 helpers to compute Part 2 answer. |
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