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2025 Day 01 (#32)
- Update CI to run PHP 8.5 and have 2025 year. - Add in additional tooling to get a new year and day setup quickly. - Update dependencies. - Add in day 1 files.
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‎.github/workflows/code-quality.yml‎

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strategy:
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matrix:
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php: [ 8.3, 8.4 ]
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php: [ 8.3, 8.4, 8.5 ]
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os: [ ubuntu-latest ]
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year: [ 2015, 2018, 2019, 2020, 2021, 2022, 2023, 2024 ]
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year: [ 2015, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 ]
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name: Unit Tests for Year ${{ matrix.year }} (PHP ${{ matrix.php }})
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‎2025/day-01.php‎

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<?php
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require __DIR__ . '/../vendor/autoload.php';
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use adventofcode\Year2025\SafeCracker;
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/**
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* --- Day 1: Secret Entrance ---
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*
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* The Elves have good news and bad news.
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*
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* The good news is that they've discovered project management! This has given them the tools they need to prevent their
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* usual Christmas emergency. For example, they now know that the North Pole decorations need to be finished soon so
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* that other critical tasks can start on time.
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*
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* The bad news is that they've realized they have a different emergency: according to their resource planning, none of
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* them have any time left to decorate the North Pole!
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*
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* To save Christmas, the Elves need you to finish decorating the North Pole by December 12th.
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*
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* Collect stars by solving puzzles. Two puzzles will be made available on each day; the second puzzle is unlocked when
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* you complete the first. Each puzzle grants one star. Good luck!
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*
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* You arrive at the secret entrance to the North Pole base ready to start decorating. Unfortunately, the password seems
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* to have been changed, so you can't get in. A document taped to the wall helpfully explains:
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*
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* "Due to new security protocols, the password is locked in the safe below. Please see the attached document for the
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* new combination."
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*
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* The safe has a dial with only an arrow on it; around the dial are the numbers 0 through 99 in order. As you turn the
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* dial, it makes a small click noise as it reaches each number.
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*
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* The attached document (your puzzle input) contains a sequence of rotations, one per line, which tell you how to open
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* the safe. A rotation starts with an L or R which indicates whether the rotation should be to the left (toward lower
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* numbers) or to the right (toward higher numbers). Then, the rotation has a distance value which indicates how many
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* clicks the dial should be rotated in that direction.
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*
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* So, if the dial were pointing at 11, a rotation of R8 would cause the dial to point at 19. After that, a rotation of
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* L19 would cause it to point at 0.
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*
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* Because the dial is a circle, turning the dial left from 0 one click makes it point at 99. Similarly, turning the
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* dial right from 99 one click makes it point at 0.
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*
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* So, if the dial were pointing at 5, a rotation of L10 would cause it to point at 95. After that, a rotation of R5
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* could cause it to point at 0.
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*
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* The dial starts by pointing at 50.
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*
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* You could follow the instructions, but your recent required official North Pole secret entrance security training
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* seminar taught you that the safe is actually a decoy. The actual password is the number of times the dial is left
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* pointing at 0 after any rotation in the sequence.
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*
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* For example, suppose the attached document contained the following rotations:
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*
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* L68
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* L30
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* R48
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* L5
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* R60
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* L55
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* L1
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* L99
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* R14
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* L82
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*
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* Following these rotations would cause the dial to move as follows:
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*
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* - The dial starts by pointing at 50.
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* - The dial is rotated L68 to point at 82.
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* - The dial is rotated L30 to point at 52.
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* - The dial is rotated R48 to point at 0.
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* - The dial is rotated L5 to point at 95.
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* - The dial is rotated R60 to point at 55.
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* - The dial is rotated L55 to point at 0.
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* - The dial is rotated L1 to point at 99.
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* - The dial is rotated L99 to point at 0.
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* - The dial is rotated R14 to point at 14.
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* - The dial is rotated L82 to point at 32.
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*
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* Because the dial points at 0 a total of three times during this process, the password in this example is 3.
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*
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* Analyze the rotations in your attached document. What's the actual password to open the door?
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*/
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$safeCracker = new SafeCracker();
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$instructions = file(__DIR__ . '/inputs/day-01.input', FILE_IGNORE_NEW_LINES);
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$totalZeros = $safeCracker->findPointedAtZerosFromInstructions($instructions);
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print('The total times zero was pointed at was ' . $totalZeros . ".\n");
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/**
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* --- Part Two ---
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*
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* You're sure that's the right password, but the door won't open. You knock, but nobody answers. You build a snowman
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* while you think.
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*
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* As you're rolling the snowballs for your snowman, you find another security document that must have fallen into
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* the snow:
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*
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* "Due to newer security protocols, please use password method 0x434C49434B until further notice."
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*
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* You remember from the training seminar that "method 0x434C49434B" means you're actually supposed to count the number
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* of times any click causes the dial to point at 0, regardless of whether it happens during a rotation or at the end
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* of one.
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*
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* Following the same rotations as in the above example, the dial points at zero a few extra times during its rotations:
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*
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* The dial starts by pointing at 50.
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* The dial is rotated L68 to point at 82; during this rotation, it points at 0 once.
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* The dial is rotated L30 to point at 52.
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* The dial is rotated R48 to point at 0.
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* The dial is rotated L5 to point at 95.
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* The dial is rotated R60 to point at 55; during this rotation, it points at 0 once.
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* The dial is rotated L55 to point at 0.
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* The dial is rotated L1 to point at 99.
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* The dial is rotated L99 to point at 0.
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* The dial is rotated R14 to point at 14.
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* The dial is rotated L82 to point at 32; during this rotation, it points at 0 once.
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*
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* In this example, the dial points at 0 three times at the end of a rotation, plus three more times during a rotation.
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* So, in this example, the new password would be 6.
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*
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* Be careful: if the dial were pointing at 50, a single rotation like R1000 would cause the dial to point at 0 ten
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* times before returning back to 50!
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*
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* Using password method 0x434C49434B, what is the password to open the door?
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*/
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$totalZeros = $safeCracker->findZerosHitFromInstructions($instructions);
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print('The total times zero was hit was ' . $totalZeros . ".\n");

‎2025/inputs/day-01-sample.input‎

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L68
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L30
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R48
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L5
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R60
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L55
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L1
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L99
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R14
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L82

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