adventofcode2021 VS advent_of_code

Misunderstood part 2 at first but I knew it would be a dynamic programming thing simply based on the task itself. This let me eventually clear up my misunderstanding. Had an ugly solution where I always switch between player 1 and 2 based on a toggle, and then saw this beauty so I that clever switching as well.

Using a parser for part 1: See here

Python, 26 lines

``` https://github.com/r0f1/adventofcode2021/blob/master/day01/main.py

Here's the relevant extract from my (recursive) solution. Full code on GitHub.

Like others, I used lcm. Here's an extract of the solution, omitting parsing and main(). Full solution on GitHub.

Solutions to parts 1 and 2 nearly identical and pretty much worked first time. Nothing clever here. This was far simpler than I thought it would be. I probably spent most time trying to think of a mathematical way of getting all points between p1 and p2. In the end, I just constructed two ranges. Full code here.

Full code on github.

The core of my solution below using numpy (because I'm learning it!). See github for full code.

Python 3 solution using numpy. I got held up because I assume (but know better) that numpy arrays are [x,y] instead of [row, col], which is [y,x].

Below is the new solution, which works for part 1 and 2. The full code is on GitHub.

These are the key functions. The whole code is on GitHub

Part 2 (extract shown below) was a matter of starting with the low points found in part 1 then recursively looking around for relevant points. Full code on GitHub

Code is on GitHub.