Day 4

2022-12-04 15:01:31 +01:00
parent 6ba1e39d98
commit 15a59bae60
4 changed files with 1296 additions and 2 deletions
--- a/day4/Cargo.lock
+++ b/day4/Cargo.lock
@@ -0,0 +1,243 @@
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--- a/day4/Cargo.toml
+++ b/day4/Cargo.toml
@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
+color-eyre = "0.6.2"
+itertools = "0.10.5"
--- a/day4/input.txt
+++ b/day4/input.txt
--- a/day4/src/main.rs
+++ b/day4/src/main.rs
@@ -1,3 +1,52 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::read_to_string;
+
+use color_eyre::Result;
+use itertools::Itertools;
+
+fn initial(input: &str) -> (usize, usize) {
+    let ranges = input.lines().map(|line| {
+        line.split_terminator(',')
+            .map(|range| {
+                let (lower, upper): (usize, usize) = range
+                    .split_terminator('-')
+                    .map(|number| number.parse::<usize>().unwrap())
+                    .take(2)
+                    .collect_tuple()
+                    .unwrap();
+                lower..=upper
+            })
+            .take(2)
+            .collect_tuple()
+            .unwrap()
+    });
+    let containing = *ranges
+        .clone()
+        .map(|(first, second)| {
+            first.contains(second.start()) && first.contains(second.end())
+                || second.contains(first.start()) && second.contains(first.end())
+        })
+        .counts()
+        .get(&true)
+        .unwrap_or(&0usize);
+    let overlaping = *ranges
+        .map(|(first, second)| {
+            first.contains(second.start())
+                || first.contains(second.end())
+                || second.contains(first.start())
+                || second.contains(first.end())
+        })
+        .counts()
+        .get(&true)
+        .unwrap_or(&0usize);
+    (containing, overlaping)
+}
+
+fn main() -> Result<()> {
+    let input = read_to_string("input.txt")?;
+    let (containing, overlaping) = initial(&input);
+    println!(
+        "{} pairs have containing ranges, {} ranges overlap",
+        containing, overlaping
+    );
+    Ok(())
 }