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Implementation day 12

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Bert Peters
2020-12-12 08:00:35 +01:00
parent 7649d628e7
commit ea839af850
3 changed files with 886 additions and 2 deletions
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use std::io::Read;
use crate::common::Lines;
use crate::Solution;
// Rotate clockwise
fn rotate(amount: i32, (x, y): (i32, i32)) -> (i32, i32) {
debug_assert!(amount >= 0);
debug_assert_eq!(amount % 90, 0);
match amount {
90 => (y, -x),
180 => (-x, -y),
270 => (-y, x),
360 => (x, y),
_ => panic!("Invalid rotate manouvre {}", amount),
}
}
#[derive(Default)]
pub struct Day12;
impl Solution for Day12 {
fn part1(&mut self, _input: &mut dyn Read) -> String {
todo!()
fn part1(&mut self, input: &mut dyn Read) -> String {
let mut x = 0;
let mut y = 0;
let mut v = (1, 0);
for line in Lines::new(input) {
let dir = &line[0..1];
let amount: i32 = line[1..].parse().unwrap();
match dir {
"N" => y += amount,
"E" => x += amount,
"S" => y -= amount,
"W" => x -= amount,
"F" => {
let (dx, dy) = v;
x += amount * dx;
y += amount * dy;
}
"R" => v = rotate(amount, v),
"L" => v = rotate(360 - amount, v),
_ => panic!("Invalid direction '{}'", dir),
};
}
(x.abs() + y.abs()).to_string()
}
fn part2(&mut self, input: &mut dyn Read) -> String {
let mut x = 0;
let mut y = 0;
let mut wx = 10;
let mut wy = 1;
for line in Lines::new(input) {
let dir = &line[0..1];
let amount: i32 = line[1..].parse().unwrap();
match dir {
"N" => wy += amount,
"E" => wx += amount,
"S" => wy -= amount,
"W" => wx -= amount,
"F" => {
x += wx * amount;
y += wy * amount;
}
"R" => {
let v = rotate(amount, (wx, wy));
wx = v.0;
wy = v.1;
}
"L" => {
let v = rotate(360 - amount, (wx, wy));
wx = v.0;
wy = v.1;
}
_ => panic!("Invalid direction '{}'", dir),
};
}
(x.abs() + y.abs()).to_string()
}
}
#[cfg(test)]
mod tests {
use crate::test_implementation;
use super::*;
const SAMPLE: &[u8] = include_bytes!("../samples/12.txt");
#[test]
fn sample_part1() {
test_implementation!(Day12, 1, SAMPLE, 25);
}
#[test]
fn sample_part2() {
test_implementation!(Day12, 2, SAMPLE, 286);
}
}