1 files changed, 64 insertions, 0 deletions
diff --git a/aoc22/day2/src/main.rs b/aoc22/day2/src/main.rs
new file mode 100644
index 0000000..51936b8
--- /dev/null
+++ b/aoc22/day2/src/main.rs
@@ -0,0 +1,64 @@
+fn main() {
+    let input = lib::read_input(2);
+
+    part1(&input);
+    part2(&input);
+}
+
+fn part1(input: &str) {
+    let mut score = 0;
+
+    for line in input.split("\n") {
+        let mut split = line.split(" ").flat_map(|s| s.chars().next());
+        let Some(opp) = split.next() else { continue };
+        let me = split.next().unwrap();
+
+        let outcome_score = match (opp, me) {
+            ('A', 'Z') | ('B', 'X') | ('C', 'Y') => 0,
+            ('A', 'X') | ('B', 'Y') | ('C', 'Z') => 3,
+            ('A', 'Y') | ('B', 'Z') | ('C', 'X') => 6,
+            _ => unreachable!(),
+        };
+
+        let choice_score = match me {
+            'X' => 1,
+            'Y' => 2,
+            'Z' => 3,
+            _ => unreachable!(),
+        };
+
+        score += outcome_score + choice_score;
+    }
+
+    println!("{}", score);
+}
+
+fn part2(input: &str) {
+    let mut score = 0;
+
+    for line in input.split("\n") {
+        let mut split = line.split(" ").flat_map(|s| s.chars().next());
+        let Some(opp) = split.next() else { continue };
+        let outcome = split.next().unwrap();
+
+        let opp = match opp {
+            'A' => 0,
+            'B' => 1,
+            'C' => 2,
+            _ => unreachable!(),
+        };
+
+        let (me, outcome_score) = match outcome {
+            'X' => ((opp - 1 + 3) % 3, 0),
+            'Y' => (opp, 3),
+            'Z' => ((opp + 1 + 3) % 3, 6),
+            _ => unreachable!(),
+        };
+
+        let choice_score = me + 1;
+
+        score += outcome_score + choice_score;
+    }
+
+    println!("{}", score);
+}