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Very dirty solution day 13

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Bert Peters
2021-12-13 08:29:53 +01:00
parent 07cbf6cf53
commit d471f170b3
3 changed files with 1061 additions and 4 deletions
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894
2021/inputs/13.txt Normal file
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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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2021/src/day13.rs
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use std::collections::HashSet;
use std::io::Read; use std::io::Read;
pub fn part1(_input: &mut dyn Read) -> String { use nom::branch::alt;
todo!() use nom::bytes::complete::tag;
use nom::sequence::tuple;
use nom::IResult;
use crate::common::LineIter;
type Coords = (u16, u16);
enum Fold {
X(u16),
Y(u16),
} }
pub fn part2(_input: &mut dyn Read) -> String { fn parse_coordinates(input: &str) -> IResult<&str, Coords> {
todo!() use nom::character::complete::char;
use nom::character::complete::u16;
let (input, (x, _, y)) = tuple((u16, char(','), u16))(input)?;
Ok((input, (x, y)))
}
fn parse_fold(input: &str) -> IResult<&str, Fold> {
use nom::character::complete::char;
use nom::character::complete::u16;
let (input, (_, axis, _, coord)) = tuple((
tag("fold along "),
alt((char('x'), char('y'))),
char('='),
u16,
))(input)?;
let fold = match axis {
'x' => Fold::X(coord),
'y' => Fold::Y(coord),
_ => unreachable!("Should be filtered by nom"),
};
Ok((input, fold))
}
fn apply_fold(dots: &mut HashSet<Coords>, fold: Fold) {
let mut to_fold = Vec::new();
match fold {
Fold::X(coord) => dots.retain(|&(x, y)| {
if x < coord {
true
} else {
to_fold.push((2 * coord - x, y));
false
}
}),
Fold::Y(coord) => dots.retain(|&(x, y)| {
if y < coord {
true
} else {
to_fold.push((x, 2 * coord - y));
false
}
}),
}
dots.extend(to_fold.drain(..));
}
fn print_dots(dots: &HashSet<Coords>) -> String {
let (x, y) = dots
.iter()
.fold((0, 0), |(xc, yc), &(xn, yn)| (xc.max(xn), yc.max(yn)));
let mut buffer = String::with_capacity((x as usize + 1) * y as usize);
for y in 0..=y {
for x in 0..=x {
if dots.contains(&(x, y)) {
buffer.push('#');
} else {
buffer.push(' ');
}
}
buffer.push('\n');
}
buffer.pop();
buffer
}
pub fn part1(input: &mut dyn Read) -> String {
let mut reader = LineIter::new(input);
let mut dots = HashSet::new();
while let Some(line) = reader.next() {
if line == "" {
break;
}
let (_, coords) = parse_coordinates(line).unwrap();
dots.insert(coords);
}
let fold = parse_fold(reader.next().unwrap()).unwrap().1;
apply_fold(&mut dots, fold);
dots.len().to_string()
}
pub fn part2(input: &mut dyn Read) -> String {
let mut reader = LineIter::new(input);
let mut dots = HashSet::new();
while let Some(line) = reader.next() {
if line == "" {
break;
}
let (_, coords) = parse_coordinates(line).unwrap();
dots.insert(coords);
}
while let Some(line) = reader.next() {
let fold = parse_fold(line).unwrap().1;
apply_fold(&mut dots, fold);
}
print_dots(&dots)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_implementation;
const SAMPLE: &[u8] = include_bytes!("samples/13.txt");
#[test]
fn sample_part() {
test_implementation(part1, SAMPLE, 17);
}
} }

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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