🎄 Advent of Code 2025 Solutions ⭐

My solutions for Advent of Code 2025 - a series of daily programming puzzles released throughout December. 🎅

About Advent of Code 📖

Advent of Code is an Advent calendar of holiday-themed programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

Structure 📂

aoc-2025/
├── README.md
├── day1.ipynb          # Day 1 solution
├── day2.ipynb          # Day 2 solution
├── ...                 # Days 3-25 follow the same pattern
└── data/
    ├── day1-data.txt   # Day 1 puzzle input
    ├── day1-test.txt   # Day 1 test case
    ├── day2-data.txt   # Day 2 puzzle input
    ├── day2-test.txt   # Day 2 test case
    └── ...             # Additional days follow the same pattern

Solutions 🧩

Each day's solution is contained in a Jupyter notebook (dayN.ipynb) with:

• Problem description and approach
• Solution code for Part 1 and Part 2
• Test cases and actual puzzle input
• Performance notes and optimizations

Completed Days ✨

• Day 1: day1.ipynb 🎁
• Day 2: day2.ipynb 🎁
• Day 3: day3.ipynb 🎁
• Day 4: day4.ipynb 🎁
• Day 5: day5.ipynb 🎁
• Day 6: day6.ipynb 🎁
• Day 7: day7.ipynb 🎁
• Day 8: day8.ipynb 🎁
• Day 9: day9.ipynb 🎁
• Day 10: day10.ipynb Part 2 solved with z3 - would like to solve without helper library later

Running Solutions 🚀

All solutions are implemented in Python using Jupyter notebooks. To run:

1. Open the notebook in VS Code or Jupyter
2. Execute cells sequentially
3. Test data validates the approach before running on actual input

Notes 📝

• Solutions prioritize clarity and correctness over performance
• Some solutions include multiple approaches (brute force → optimized)
• Test cases are used to validate logic before running on full input
• Comments explain the problem requirements and solution approach

❄️ Happy Coding! 🎄 Help the elves save the holiday season! 🧝‍♂️🧝‍♀️