1 files changed, 25 insertions, 0 deletions
diff --git a/2024/1/p2.rs b/2024/1/p2.rs
new file mode 100644
index 0000000..41eeea4
--- /dev/null
+++ b/2024/1/p2.rs
@@ -0,0 +1,25 @@
+use std::collections::HashMap;
+
+const INPUT_FILE: &str = "input";
+
+fn main() {
+    let input = std::fs::read_to_string(INPUT_FILE).expect("Reading input file");
+    let mut left: Vec<u32> = vec![];
+    let mut right: HashMap<u32, u32> = HashMap::new();
+    for line in input.lines() {
+        let mut fields = line.split_whitespace();
+        let e = "Wrong file format";
+        left.push(fields.next().expect(e).parse().expect(e));
+        let r: u32 = fields.next().expect(e).parse().expect(e);
+        match right.get(&r) {
+            None => right.insert(r, 1),
+            Some(v) => right.insert(r, v+1),
+        };
+    }
+
+    let mut distance: u32 = 0;
+    for l in left {
+        distance += l * right.get(&l).unwrap_or(&0);
+    }
+    println!("Distance: {}", distance);
+}