GPG Key ID:
8F93B68BD37255B8
4 changed files with 326 additions and 0 deletions
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# This file is automatically @generated by Cargo. |
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# It is not intended for manual editing. |
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version = 3 |
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[[package]] |
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name = "c-ratio" |
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version = "0.1.0" |
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[package] |
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name = "c-ratio" |
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version = "0.1.0" |
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edition = "2021" |
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html |
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[dependencies] |
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use std::{collections::HashMap, fmt::Display}; |
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static INPUT: &str = include_str!("input"); |
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fn main() { |
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println!("part 1: {}", part1()); |
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println!("part 2: {}", part2()); |
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} |
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struct Grid { |
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data: Vec<Vec<char>>, |
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} |
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impl From<&str> for Grid { |
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fn from(value: &str) -> Self { |
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let data = value.lines().map(|line| line.chars().collect()).collect(); |
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Self { data } |
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} |
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} |
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#[derive(Clone, Copy)] |
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struct Number { |
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value: usize, |
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location: Point, |
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length: usize, |
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} |
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#[derive(Clone, Copy, Hash, PartialEq, Eq)] |
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struct Symbol { |
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sym: char, |
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location: Point, |
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} |
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#[derive(Clone, Copy, Hash, PartialEq, Eq)] |
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struct Point { |
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x: usize, |
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y: usize, |
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} |
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impl Display for Number { |
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
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write!( |
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f, |
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"{} at {},{}", |
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self.value, self.location.x, self.location.y |
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) |
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} |
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} |
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impl Grid { |
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fn get(&self, x: usize, y: usize) -> Option<char> { |
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self.data.get(y).and_then(|row| row.get(x)).copied() |
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} |
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fn read_numbers(&self) -> Vec<Number> { |
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self.data |
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.iter() |
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.enumerate() |
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.flat_map(|(iy, line)| { |
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let mut buf = String::new(); |
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let mut nums_on_line = Vec::new(); |
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let mut x = 0; |
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for (ix, c) in line.iter().enumerate() { |
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if c.is_ascii_digit() { |
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if buf.is_empty() { |
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x = ix; |
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} |
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buf.push(*c); |
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} else if !buf.is_empty() { |
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let length = buf.len(); |
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let value = buf.parse().unwrap(); |
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buf = "".into(); |
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nums_on_line.push(Number { |
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value, |
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length, |
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location: Point { x, y: iy }, |
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}); |
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} |
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} |
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if !buf.is_empty() { |
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let length = buf.len(); |
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let value = buf.parse().unwrap(); |
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nums_on_line.push(Number { |
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value, |
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length, |
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location: Point { x, y: iy }, |
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}); |
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} |
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nums_on_line |
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}) |
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.collect() |
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} |
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fn get_adjacent_points(&self, num: &Number) -> Vec<Point> { |
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let mut out = Vec::new(); |
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let x_min = num.location.x.saturating_sub(1); |
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let x_max = num.location.x + num.length; |
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let y_min = num.location.y.saturating_sub(1); |
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let y_max = num.location.y + 1; |
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for x in x_min..=x_max { |
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for y in y_min..=y_max { |
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out.push(Point { x, y }) |
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} |
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} |
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|
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out |
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} |
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|
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fn has_adjacent_symbol(&self, num: &Number) -> bool { |
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self.get_adjacent_points(num) |
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.into_iter() |
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.filter_map(|p| self.get(p.x, p.y)) |
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.any(|c| c != '.' && !c.is_ascii_digit()) |
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} |
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|
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fn adjacent_symbols(&self, num: &Number) -> Vec<Symbol> { |
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self.get_adjacent_points(num) |
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.into_iter() |
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.filter_map(|p| { |
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self.get(p.x, p.y) |
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.filter(|c| *c != '.' && !c.is_ascii_digit()) |
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.map(|c| Symbol { |
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sym: c, |
||||
location: p, |
||||
}) |
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}) |
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.collect() |
||||
} |
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} |
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|
||||
fn part1() -> usize { |
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let grid = Grid::from(INPUT); |
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grid.read_numbers() |
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.into_iter() |
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.filter(|num| grid.has_adjacent_symbol(num)) |
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.map(|num| num.value) |
||||
.sum() |
||||
} |
||||
|
||||
fn part2() -> usize { |
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let grid = Grid::from(INPUT); |
||||
|
||||
let mut map: HashMap<Symbol, Vec<Number>> = HashMap::new(); |
||||
|
||||
grid.read_numbers() |
||||
.into_iter() |
||||
.map(|num| (num, grid.adjacent_symbols(&num))) |
||||
.filter(|(_, syms)| syms.iter().any(|sym| sym.sym == '*')) |
||||
.map(|(num, syms)| { |
||||
( |
||||
syms.into_iter() |
||||
.filter(|s| s.sym == '*') |
||||
.collect::<Vec<_>>()[0], |
||||
num, |
||||
) |
||||
}) |
||||
.for_each(|(sym, num)| { |
||||
if let Some(v) = map.get_mut(&sym) { |
||||
v.push(num); |
||||
} else { |
||||
map.insert(sym, vec![num]); |
||||
} |
||||
}); |
||||
|
||||
map.into_values() |
||||
.filter(|v| v.len() == 2) |
||||
.map(|v| v.into_iter().map(|n| n.value).product::<usize>()) |
||||
.sum() |
||||
} |
||||
Loading…
Reference in new issue