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add day 13

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This commit is contained in:
Adam Jeniski 2022-09-09 17:36:58 -04:00
parent ad6b1b1c93
commit ed97d0d863
3 changed files with 943 additions and 0 deletions
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806
inputs/13.txt Normal file
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311,362
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681,821
fold along x=655
fold along y=447
fold along x=327
fold along y=223
fold along x=163
fold along y=111
fold along x=81
fold along y=55
fold along x=40
fold along y=27
fold along y=13
fold along y=6

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inputs/13_test.txt Normal file
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6,10
0,14
9,10
0,3
10,4
4,11
6,0
6,12
4,1
0,13
10,12
3,4
3,0
8,4
1,10
2,14
8,10
9,0
fold along y=7
fold along x=5

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use std::collections::HashSet;
type Point = (i32, i32);
#[derive(Debug)]
enum Fold {
X(i32),
Y(i32),
}
fn part_one(points: Vec<Point>, folds: Vec<Fold>) -> i32 {
match folds.first().expect("first fold") {
Fold::X(coord) => points
.into_iter()
.map(|(x, y): Point| (x.abs_diff(*coord) as i32, y))
.collect::<HashSet<_>>(),
Fold::Y(coord) => points
.into_iter()
.map(|(x, y): Point| (x, y.abs_diff(*coord) as i32))
.collect::<HashSet<_>>(),
}
.len() as i32
}
fn part_two(points: Vec<Point>, folds: Vec<Fold>) {
let mut points = points.into_iter().collect::<HashSet<_>>();
for fold in folds {
points = match fold {
Fold::X(coord) => points
.into_iter()
.map(|(x, y): Point| (coord - x.abs_diff(coord) as i32, y))
.collect::<HashSet<_>>(),
Fold::Y(coord) => points
.into_iter()
.map(|(x, y): Point| (x, coord - y.abs_diff(coord) as i32))
.collect::<HashSet<_>>(),
};
}
let max_x = points
.iter()
.fold(0, |acc, (x, _)| if *x > acc { *x } else { acc });
let max_y = points
.iter()
.fold(0, |acc, (_, y)| if *y > acc { *y } else { acc });
let lines: Vec<Vec<char>> = (0..=max_y)
.map(|y| {
(0..=max_x)
.map(|x| if points.contains(&(x, y)) { '#' } else { ' ' })
.collect()
})
.collect();
for line in lines {
let line = line.into_iter().collect::<String>();
println!("{line}");
}
}
#[cfg(test)]
mod tests {
use super::*;
fn parse_inputs(input: &str) -> (Vec<Point>, Vec<Fold>) {
let mut sections = input.split("\n\n");
(
sections
.next()
.expect("coords section")
.lines()
.map(|line| {
let mut coords = line
.split(',')
.map(|num_str| num_str.parse().expect("coord number"));
(
coords.next().expect("coord x value"),
coords.next().expect("coord y value"),
)
})
.collect(),
sections
.next()
.expect("fold instructions section")
.lines()
.map(|line| {
let (direction, num) =
line.split(' ').nth(2).expect("fold equation").split_at(2);
let num = num.parse().expect("coordinate to fold at");
if direction == "x=" {
Fold::X(num)
} else {
Fold::Y(num)
}
})
.collect(),
)
}
#[test]
fn part_one_sample_test() {
let input = include_str!("../inputs/13_test.txt");
let (points, folds) = parse_inputs(input);
assert_eq!(part_one(points, folds), 17);
}
#[test]
fn part_one_test() {
let input = include_str!("../inputs/13.txt");
let (points, folds) = parse_inputs(input);
assert_eq!(part_one(points, folds), 653);
}
#[test]
fn part_two_test() {
let input = include_str!("../inputs/13.txt");
let (points, folds) = parse_inputs(input);
part_two(points, folds);
}
}