bendns' repos / aoc
heh
Diffstat (limited to 'src/main.rs')
-rw-r--r--src/main.rs40
1 files changed, 23 insertions, 17 deletions
diff --git a/src/main.rs b/src/main.rs
index ff57183..ea8f0d2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,19 +35,21 @@ macro_rules! sret {
};
}
-fn test(mat: &[&[u8]], p: (u8, u8), d: D) -> u16 {
+const SZ: u8 = 110;
+
+fn test(mat: &[[u8; SZ as usize + 1]; SZ as usize], p: (u8, u8), d: D) -> u16 {
use D::*;
- let mut e = vec![0u128; mat.len()];
+ let mut e = vec![0u128; SZ.nat()];
let mut been = HashSet::new();
fn beam(
- mat: &[&[u8]],
+ mat: &[[u8; SZ as usize + 1]; SZ as usize],
(mut x, mut y): (u8, u8),
mut d: D,
e: &mut [u128],
been: &mut HashSet<(u8, u8, D)>,
) {
loop {
- if y >= mat.len() as u8 || x >= mat.len() as u8 {
+ if y >= SZ || x >= SZ {
break;
}
bits!(e[y.nat()] + x);
@@ -98,23 +100,27 @@ fn test(mat: &[&[u8]], p: (u8, u8), d: D) -> u16 {
}}
}
}
- beam(&mat, p, d, &mut e, &mut been);
+ beam(mat, p, d, &mut e, &mut been);
e.iter().map(|x| x.count_ones() as u16).sum::<u16>()
}
-pub fn run(i: &str) -> impl Display {
+use rayon::prelude::*;
+pub fn p2(mat: &[[u8; 111]; 110]) -> impl Display {
use D::*;
- let mat = i.行().collect::<Box<_>>();
- let mut max = 0;
- for i in 0..mat.len() as u8 {
- max = max.max(test(&mat, (i, 0), S));
- max = max.max(test(&mat, (i, mat.len() as u8 - 1), N));
- }
- for j in 0..mat.len() as u8 {
- max = max.max(test(&mat, (0, j), E));
- max = max.max(test(&mat, (mat.len() as u8 - 1, j), W));
- }
- max
+ let a = (0..SZ).into_par_iter().map(|i| test(mat, (i, 0), S)).max();
+ let b = (0..SZ).into_par_iter().map(|i| test(mat, (i, SZ), N)).max();
+ let c = (0..SZ).into_par_iter().map(|i| test(mat, (0, i), E)).max();
+ let d = (0..SZ).into_par_iter().map(|i| test(mat, (SZ, i), W)).max();
+ a.α().max(b.α()).max(c.α()).max(d.α())
+}
+
+pub fn p1(mat: &[[u8; 111]; 110]) -> impl Display {
+ test(mat, (0, 0), D::E)
+}
+
+pub fn run(i: &str) -> impl Display {
+ let mat = unsafe { &*(i.as_bytes().as_ptr() as *const [[u8; 111]; 110]) };
+ p1(mat)
}
fn main() {