d2p1

day2/src/main.rs

@@ -0,0 +1,33 @@
+use std::env;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::BufRead;
+
+fn score(line: String) -> i64 {
+    match line.trim() {
+        "A X" => 1 + 3,
+        "A Y" => 2 + 6,
+        "A Z" => 3 + 0,
+        "B X" => 1 + 0,
+        "B Y" => 2 + 3,
+        "B Z" => 3 + 6,
+        "C X" => 1 + 6,
+        "C Y" => 2 + 0,
+        "C Z" => 3 + 3,
+        _other => 0,
+    }
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let input = &args[1];
+    let reader = BufReader::new(File::open(input).expect("where file?"));
+
+    let mut sum = 0;
+    for line in reader.lines() {
+        sum += score(line.unwrap());
+    }
+
+    println!("Sum: {}", sum);
+}
+