Day 04

src/day03/mod.rs

@@ -24,7 +24,7 @@ pub fn run() {
                 val(lc.unwrap())
             })
             .sum();
-        println!("Day 2, Part 01: {}", lines);
+        println!("Day 3, Part 01: {}", lines);
     }
 
     #[cfg(feature = "part2")]
@@ -42,6 +42,6 @@ pub fn run() {
                 val(common.unwrap())
             })
             .sum();
-        println!("Day 2, Part 02: {}", lines);
+        println!("Day 3, Part 02: {}", lines);
     }
 }

src/day04/mod.rs

@@ -0,0 +1,38 @@
+use crate::read;
+
+fn get_ranges(elf: &str) -> std::ops::RangeInclusive<i32> {
+    let r = elf
+        .split_once('-')
+        .map(|e| (e.0.parse().unwrap(), e.1.parse().unwrap()))
+        .unwrap();
+    r.0..=r.1
+}
+
+pub fn run() {
+    let input = read("04");
+
+    let lines = input
+        .lines()
+        .map(|l| {
+            let pairs = l.split_once(',').unwrap();
+            (get_ranges(pairs.0), get_ranges(pairs.1))
+        })
+        .collect::<Vec<_>>();
+    #[cfg(feature = "part1")]
+    {
+        let count = lines
+            .iter()
+            .filter(|(a, b)| a.clone().all(|x| b.contains(&x)) || b.clone().all(|x| a.contains(&x)))
+            .count();
+        println!("Day 4, Part 01: {}", count);
+    }
+
+    #[cfg(feature = "part2")]
+    {
+        let count = lines
+            .iter()
+            .filter(|(a, b)| a.clone().any(|x| b.contains(&x)) || b.clone().any(|x| a.contains(&x)))
+            .count();
+        println!("Day 4, Part 02: {}", count);
+    }
+}

src/main.rs

@@ -4,6 +4,7 @@ use std::time::Instant;
 mod day01;
 mod day02;
 mod day03;
+mod day04;
 
 fn main() {
     let today = Local::now().day();
@@ -17,6 +18,9 @@ fn main() {
     if cfg!(feature = "day03") || (cfg!(feature = "today") && today == 3) {
         day03::run();
     }
+    if cfg!(feature = "day04") || (cfg!(feature = "today") && today == 4) {
+        day04::run();
+    }
     println!("Finished, time taken: {:?}", now.elapsed())
 }