2023.5

4 files changed, 335 insertions, 0 deletions

diff --git a/2023/rs/Cargo.lock b/2023/rs/Cargo.lock
index 15fb1ac..e7c0d6f 100644
--- a/2023/rs/Cargo.lock
+++ b/2023/rs/Cargo.lock
@@ -3,6 +3,13 @@
 version = 3
 
 [[package]]
+name = "five"
+version = "0.1.0"
+dependencies = [
+ "nom",
+]
+
+[[package]]
 name = "four"
 version = "0.1.0"
 
diff --git a/2023/rs/code/five/Cargo.toml b/2023/rs/code/five/Cargo.toml
new file mode 100644
index 0000000..d1c20be
--- /dev/null
+++ b/2023/rs/code/five/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "five"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom = "7.1.3"
diff --git a/2023/rs/code/five/src/input.txt b/2023/rs/code/five/src/input.txt
new file mode 100644
index 0000000..41b77cb
--- /dev/null
+++ b/2023/rs/code/five/src/input.txt
@@ -0,0 +1,237 @@
+seeds: 1187290020 247767461 40283135 64738286 2044483296 66221787 1777809491 103070898 108732160 261552692 3810626561 257826205 3045614911 65672948 744199732 300163578 3438684365 82800966 2808575117 229295075
+
+seed-to-soil map:
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+soil-to-fertilizer map:
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+
+fertilizer-to-water map:
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+water-to-light map:
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+
+light-to-temperature map:
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+
+temperature-to-humidity map:
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+humidity-to-location map:
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diff --git a/2023/rs/code/five/src/main.rs b/2023/rs/code/five/src/main.rs
new file mode 100644
index 0000000..79ba943
--- /dev/null
+++ b/2023/rs/code/five/src/main.rs
@@ -0,0 +1,82 @@
+#![feature(iter_array_chunks)]
+
+use nom::{Parser, IResult, Finish};
+use nom::character::complete::*;
+use nom::bytes::complete::*;
+use nom::sequence::*;
+use nom::multi::*;
+
+use std::io::Write;
+
+static INPUT: &str = include_str!("input.txt");
+
+#[derive(Debug, Copy, Clone)]
+struct Entry {
+  source_start: u32,
+  dest_start: u32,
+  len: u32
+}
+
+fn parse(i: &str) -> IResult<&str, (Vec<u32>, Vec<Vec<Entry>>)> {
+  let (i, (_, seeds, mut entries)) = tuple((
+    tag("seeds: "),
+    separated_list1(tag(" "), digit1.map(|s: &str| s.parse().unwrap())),
+    many1(preceded(
+      tuple((line_ending, line_ending, not_line_ending, line_ending)),
+      separated_list1(
+        line_ending,
+        tuple((
+          digit1,
+          tag(" "),
+          digit1,
+          tag(" "),
+          digit1))
+          .map(|(a, _, b, _, c): (&str, _, &str, _, &str)|
+            Entry { dest_start: a.parse().unwrap(), source_start: b.parse().unwrap(), len: c.parse().unwrap() }))))))
+    (i)?;
+
+  for entry in &mut entries {
+    entry.sort_by_key(|e| e.source_start);
+  }
+
+  Ok((i, (seeds, entries)))
+}
+
+fn main() {
+  let (seeds, entries) = parse(INPUT).finish().unwrap().1;
+
+  let map_seed = |s: u32|
+    entries.iter().fold(
+      s,
+      |s, el| {
+        let entry = el.iter().cloned().find(
+          |i| i.source_start <= s && s - i.source_start < i.len)
+          .unwrap_or(Entry { source_start: 0, dest_start: 0, len: u32::MAX });
+        s - entry.source_start + entry.dest_start
+      });
+
+
+  let min_loc = seeds.iter().cloned().map(map_seed).min().unwrap();
+  println!("Minimum `location`: {min_loc}");
+
+  // [12:48 AM] got p1
+  // [12:48 AM] oh this sucks
+  // [12:50 AM] do i just
+  // [12:50 AM] brute force it
+  // [12:50 AM] i could like
+  // [12:50 AM] write something clever here
+  // [12:51 AM] like i think i could do something like lifting the mapping between the layers and creating one final mapping, and then just checking against that
+  // [12:51 AM] and just finding the lowest start number within the bounds of all the seed ranges
+  // [12:51 AM] but i dont feel like doing that
+
+  #[cfg(debug_assertions)]
+  eprintln!("Warning: Debug build detected! This next bit takes a while, so I'd suggest compiling `--release`.");
+
+  let min_loc_ranged = seeds.iter().array_chunks::<2>()
+    .inspect(|[a, b]| { print!("\x1B[2KChecking {} => {}...\r", *a, *a + *b); std::io::stdout().flush().unwrap(); })
+    .flat_map(|[a, b]| *a..(*a+*b))
+    .map(map_seed)
+    .min().unwrap();
+
+  println!("Minimum `location` within ranges: {min_loc_ranged}");
+}