Day 03

src/day03/mod.rs

@@ -1,23 +1,47 @@
 use crate::read;
 
+fn val(c: char) -> u32 {
+    if c.is_lowercase() {
+        c as u32 - 96
+    } else {
+        26 + c as u32 - 64
+    }
+}
 
 pub fn run() {
-    let input = read("02");
-    let lines = input
-        .lines()
-        .map(|l| {
-            l
-        });
+    let input = read("03");
 
     #[cfg(feature = "part1")]
     {
-        let a = "TODO";
-        eprintln!("Day 2, Part 01: {}", a);
+        let lines: u32 = input
+            .lines()
+            .map(|l| {
+                let l = l.to_string();
+                let len = l.len() / 2;
+                let left = &l[0..len];
+                let right = &l[len..];
+                let lc = left.chars().find(|c| right.chars().any(|rc| rc == *c));
+                val(lc.unwrap())
+            })
+            .sum();
+        println!("Day 2, Part 01: {}", lines);
     }
 
     #[cfg(feature = "part2")]
     {
-        let b = "TODO";
-        eprintln!("Day 2, Part 02: {}", b);
+        let lines: u32 = input.lines().collect::<Vec<_>>()[..] // Not a fan of collect here
+            .chunks(3)
+            .map(|l| {
+                let first = l[0];
+                let second = l[1];
+                let third = l[2];
+
+                let common = first
+                    .chars()
+                    .find(|f| second.chars().any(|s| s == *f) && third.chars().any(|t| t == *f));
+                val(common.unwrap())
+            })
+            .sum();
+        println!("Day 2, Part 02: {}", lines);
     }
 }