bendns' repos / aoc
heh
Diffstat (limited to 'src/main.rs')
-rw-r--r--src/main.rs32
1 files changed, 16 insertions, 16 deletions
diff --git a/src/main.rs b/src/main.rs
index bda69a0..6926456 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,18 @@
#![allow(confusable_idents, uncommon_codepoints, mixed_script_confusables)]
-#![feature(array_windows, test, slice_as_chunks, array_chunks)]
+#![feature(
+ array_windows,
+ test,
+ slice_as_chunks,
+ array_chunks,
+ slice_split_once,
+ byte_slice_trim_ascii
+)]
extern crate test;
mod util;
pub use util::prelude::*;
#[inline(always)]
-fn k(s: &str) -> u16 {
+fn k(s: &[u8]) -> u16 {
unsafe { *s.as_ptr().cast::<[u8; 3]>() }
.iter()
.enumerate()
@@ -21,17 +28,12 @@ fn end(x: u16) -> bool {
(x >> (2 * 5) & 0b11111) == (b'Z' - b'A') as u16
}
-pub fn run(i: &str) -> impl Display {
- let mut lines = i.lines();
- let line = lines.by_ref().Δ().as_bytes();
- let map = lines
- .skip(1)
- .map(|x| {
- x.μ('=')
- .mr(|x| x.trim()[1..x.len() - 2].μ(',').mb(str::trim).mb(k))
- .ml(str::trim)
- .ml(k)
- })
+pub fn run(mut i: &str) -> impl Display {
+ let line = i.take_line().unwrap();
+ let map = i
+ .as_bytes()
+ .array_chunks::<17>()
+ .map(|x| (k(&x[1..4]), (k(&x[8..11]), k(&x[13..16]))))
.collect::<HashMap<_, _>>();
let mut positions = map
.keys()
@@ -68,9 +70,7 @@ pub fn run(i: &str) -> impl Display {
steps += 1;
}
let v = lcm(cycle.values().copied());
- std::mem::forget(cycle);
- std::mem::forget(findings);
- std::mem::forget(positions);
+ leek!(cycle findings positions);
v
}