[AoC2022] Rust 02-01

1 files changed, 52 insertions, 0 deletions

diff --git a/AoC2022/02/solver.rs b/AoC2022/02/solver.rs
new file mode 100644
index 0000000..1f9a394
--- /dev/null
+++ b/AoC2022/02/solver.rs
@@ -0,0 +1,52 @@
+use std::fs;
+use std::io::{self, BufRead};
+
+#[derive(Debug, PartialEq)]
+enum Hand {
+    Rock,
+    Paper,
+    Scissors,
+}
+
+fn translate(play: &str) -> Hand {
+    match play {
+        "A" | "X" => Hand::Rock,
+        "B" | "Y" => Hand::Paper,
+        "C" | "Z" => Hand::Scissors,
+        &_ => panic!(),
+    }
+}
+
+fn weight(play: Hand) -> u32 {
+    match play {
+        Hand::Rock => 1,
+        Hand::Paper => 2,
+        Hand::Scissors => 3,
+    }
+}
+
+fn fight(my: Hand, other: Hand) -> u32 {
+    match (my, other) {
+        (a, b) if a == b => 3,
+        (Hand::Rock, Hand::Scissors)
+        | (Hand::Scissors, Hand::Paper)
+        | (Hand::Paper, Hand::Rock) => 6,
+        _ => 0,
+    }
+}
+
+fn main() -> std::io::Result<()> {
+    let file = fs::File::open("input").unwrap();
+    let lines = io::BufReader::new(file).lines();
+    let mut score = 0;
+    for line in lines {
+        if let [ot, my] = line?.split_whitespace().collect::<Vec<_>>()[..] {
+            score += fight(translate(my), translate(ot)) + weight(translate(my));
+        } else {
+            todo!()
+        };
+    }
+
+    println!("{}", score);
+    Ok(())
+}