Module day19

Aplenty

Each rule is converted into a half open interval, including the start but excluding the end. For example:

• x > 10 => 10..4001
• m < 20 => 1..20
• A => 1..4001

For part one if a category is contained in a range, we send the part to the next rule, stopping when A or R is reached.

For part two we perform range splitting similar to Day 5 that converts the category into 1, 2 or 3 new ranges, then sends those ranges to the respective rule.

Structs

Input

Rule

Functions

parse

Parse each rule from the first half of the input. Leaves the second half of the input as a &str as it’s faster to iterate over each chunk of four numbers than to first collect into a vec.

part1

part2