Struct Day17 

pub struct Day17 { /* private fields */ }

2020 Day 17: Simulating a cellular automaton in three and four dimensions.

The key optimization is that the initial state is at z = w = 0 and the update rule treats all directions the same, so layers z and -z are always equal, as well as w and -w, and (z, w) and (w, z). Therefore, only layers with z >= 0 for part 1 and 0 <= w <= z for part 2 are simulated.

Each cycle first counts the neighbours of each cell within its own layer, then adds the counts from the adjacent w and z layers to get each cell’s total.

Implementations

impl Day17

pub fn new(input: &str, _: InputType) -> Result<Self, InputError>

pub fn part1(&self) -> u32

pub fn part2(&self) -> u32

Trait Implementations

impl Clone for Day17

fn clone(&self) -> Day17

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Day17

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PuzzleDate for Day17

const DATE: Date

2020 Day 17

impl PuzzleExamples<u32, u32> for Day17

const EXAMPLES: &'static [(&'static str, Option<u32>, Option<u32>)]