Document run command

day_01/src/main.rs

@@ -1,3 +1,7 @@
+//https://adventofcode.com/2024/day/1
+//
+// run command: `cargo run ./input.txt`
+
 use std::collections::HashMap;
 use std::env;
 use std::error::Error;
@@ -96,11 +100,11 @@ fn main() -> Result<(), Box<dyn Error>> {
     }
 
     println!(
-        "Difference: {}",
+        "Difference (part 1): {}",
         calculate_diff(left_list.clone(), right_list.clone())
     );
     println!(
-        "Similarity: {}",
+        "Similarity (part 2): {}",
         calculate_similarity(left_list, right_list)
     );
 

day_02/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day_02"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

day_02/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}