Two years ago, I did part of Advent of Code 2020 using the Rust language. It was a lot of fun, so let's try it again!

The problem statement

Our input looks something like this:

1000
2000
3000

4000

5000
6000

7000
8000
9000

10000

Each group of lines separated by an empty line is a list of food items an elf is carrying: each line corresponds to the number of calories in that food.