# Advent of Code 2025

## Introduction 
This is mostly so I can keep notes on my progress, in single markdown format so I can easily add it to my Silverbullet journal afterwards.

## Lessons from first day

1. Read! Oh that brain of mine, skipping half the things and missing things like count clicks not end point dial
2. Setup a proper test, make a smaller input test that you know the answer to to check the code


## Lessons second day

1. More git commits!
2. Clear history so you don't accidentally cp day1 to day2 during testing. (Undo FTW)
3. Put the central check (Serial Valid/Invalid) in a function so it's easy to add self checks in the beginning

## Lessons third day

1. Can't win em all

## Lessons fourth day

1. Need about an hour to do both, but also speeding up