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🚧 WIP on Day 4
I don't have enough time in the morning...
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2 changed files with 127 additions and 8 deletions
125
src/days/d04.rs
125
src/days/d04.rs
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@ -2,31 +2,140 @@ use super::{Answer, Day, DayImpl};
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const CURRENT_DAY: u8 = 4;
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type Data = Vec<u64>;
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#[derive(Debug, Clone,Copy)]
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enum Direction {
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East,
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West,
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North,
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South,
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NorthEast,
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NorthWest,
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SouthEast,
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SouthWest
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}
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#[derive(Debug, Clone)]
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pub struct LetterWall (Vec<Vec<char>>);
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impl LetterWall {
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fn at(&self, x: usize, y: usize) -> Option<&char> {
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let row = self.0.get(y);
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if let Some(row) = row {
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row.get(x)
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} else {
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None
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}
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}
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pub fn is_upper_left_of_xmas(&self, x: usize, y: usize) -> Option<Direction> {
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match(
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self.at( x, y), self.at( x+1, y), self.at( x+2, y), self.at( x+3, y),
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self.at( x, y+1), self.at( x+1, y+1), self.at( x+2, y+1), self.at( x+3, y+1),
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self.at( x, y+2), self.at( x+1, y+2), self.at( x+2, y+2), self.at( x+3, y+2),
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self.at( x, y+3), self.at( x+1, y+3), self.at( x+2, y+3), self.at( x+3, y+3)
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) {
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(
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Some('X'), Some('M'), Some('A'), Some('S'),
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_, _, _, _,
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_, _, _, _,
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_, _, _, _
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) => Some(Direction::East),
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(
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Some('S'), Some('A'), Some('M'), Some('X'),
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_, _, _, _,
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_, _, _, _,
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_, _, _, _
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) => Some(Direction::West),
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(
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Some('X'), _, _, _,
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Some('M'), _, _, _,
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Some('A'), _, _, _,
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Some('S'), _, _, _
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) => Some(Direction::South),
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(
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Some('S'), _, _, _,
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Some('A'), _, _, _,
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Some('M'), _, _, _,
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Some('X'), _, _, _
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) => Some(Direction::North),
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(
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Some('X'), _, _, _,
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_, Some('M'), _, _,
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_, _, Some('A'), _,
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_, _, _, Some('S')
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) => Some(Direction::SouthEast),
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(
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Some('S'), _, _, _,
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_, Some('A'), _, _,
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_, _, Some('M'), _,
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_, _, _, Some('X')
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) => Some(Direction::NorthWest),
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(
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_, _, _, Some('X'),
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_, _, Some('M'), _,
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_, Some('A'), _, _,
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Some('S'), _, _, _
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) => Some(Direction::SouthWest),
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(
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_, _, _, Some('S'),
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_, _, Some('A'), _,
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_, Some('M'), _, _,
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Some('X'), _, _, _
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) => Some(Direction::SouthWest),
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_ => None
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}
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}
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pub fn count_xmas(&self) -> u64 {
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let mut count = 0;
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for y in 0..self.0.len(){
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for x in 0..self.0[0].len() {
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if let Some(dir) = self.is_upper_left_of_xmas(x, y) {
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println!("FOUND AT {} {} '{}' - DIR: {:?}", x, y, self.0[y][x], dir);
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count += 1;
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}
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}
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}
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return count;
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}
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}
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impl From<&str> for LetterWall {
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fn from(value: &str) -> Self {
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Self (
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value
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.lines()
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.map(|v| v.chars().collect())
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.collect()
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)
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}
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}
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type Data = LetterWall;
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impl DayImpl<Data> for Day<CURRENT_DAY> {
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fn init_test() -> (Self, Data) {
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Self::init(include_str!("test_inputs/test04.txt"))
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}
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fn expected_results() -> (Answer, Answer) {
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(Answer::Number(0), Answer::Number(0))
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(Answer::Number(18), Answer::Number(0))
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}
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fn init(input: &str) -> (Self, Data) {
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(
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Self {},
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input
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.lines()
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.map(|v| v.parse::<u64>().expect("error while parsing input."))
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.collect(),
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input.into(),
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)
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}
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fn one(&self, data: &mut Data) -> Answer {
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Answer::Number(data.len() as u64)
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// NOTE TO SELF: Actual result above 2334
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Answer::Number(data.count_xmas())
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}
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fn two(&self, data: &mut Data) -> Answer {
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Answer::Number(data.len() as u64)
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Answer::Number(0)
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}
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}
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@ -0,0 +1,10 @@
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MMMSXXMASM
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MSAMXMSMSA
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AMXSXMAAMM
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MSAMASMSMX
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XMASAMXAMM
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XXAMMXXAMA
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SMSMSASXSS
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SAXAMASAAA
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MAMMMXMMMM
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MXMXAXMASX
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