d2p1

day2/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day2"
+version = "0.1.0"

day2/Cargo.toml

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+[package]
+name = "day2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day2/src/main.rs

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+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);
+}
+

day2/test.txt

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+A Y
+B X
+C Z
+