day 2

.gitignore

@@ -1,3 +1,4 @@
 target/
 input
 testinput
+main

day02/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day02"
+version = "0.1.0"

day02/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day02"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day02/src/main.rs

@@ -0,0 +1,75 @@
+use std::io::{self, BufRead};
+
+enum Outcome {
+    Won = 6,
+    Drew = 3,
+    Lost = 0
+}
+
+fn main() {
+    let lines = io::stdin().lock().lines().map(|l| l.unwrap());
+    let mut p1_sum = 0;
+    let mut p2_sum = 0;
+
+    for line in lines {
+        let (opponent, player) = line.split_once(' ').unwrap();
+        p1_sum += play_score(opponent, player);
+        p2_sum += result_score(opponent, player);
+    }
+    println!("P1: {}, P2: {}", p1_sum, p2_sum);
+}
+
+fn player_win_score(player: &str) -> usize {
+    match player {
+        "X" => 1,
+        "Y" => 2, 
+        "Z" => 3,
+        _ => panic!("at the disco")
+    }
+}
+
+fn play_score(opponent: &str, player: &str) -> usize {
+    let outcome = match (player, opponent) {
+        ("X", "C") | ("Y", "A") | ("Z", "B") => Outcome::Won,
+        ("X", "A") | ("Y", "B") | ("Z", "C") => Outcome::Drew,
+        ("X", "B") | ("Y", "C") | ("Z", "A") => Outcome::Lost,
+        _ => panic!("on the streets of london")
+    };
+    player_win_score(player) + outcome as usize
+}
+
+fn player_hand_for_outcome<'a>(outcome: &Outcome, opponent: &str) -> &'a str {
+    match outcome {
+        Outcome::Won => match opponent {
+            "A" => "Y",
+            "B" => "Z",
+            "C" => "X",
+            _ => panic!("on the streets of birmingham")
+        }
+        Outcome::Drew => match opponent {
+            "A" => "X",
+            "B" => "Y",
+            "C" => "Z",
+            _ => panic!("on the streets of carlisle")
+        },
+        Outcome::Lost => match opponent {
+            "A" => "Z",
+            "B" => "X",
+            "C" => "Y",
+            _ => panic!("dublin, dundee, humberside")
+        },
+    }
+}
+
+fn result_score(opponent: &str, result: &str) -> usize {
+    let outcome = match result {
+        "X" => Outcome::Lost,
+        "Y" => Outcome::Drew,
+        "Z" => Outcome::Won,
+        _ => panic!("the leeds side streets that you slip down")
+    };
+
+    let player = player_hand_for_outcome(&outcome, opponent);
+
+    player_win_score(player) + outcome as usize
+}

fetchinput.sh

@@ -6,4 +6,4 @@ DAY=$(printf "%01d" `date +%d`)
 ! [ "$1" = "" ] && printf "%d" $1 >/dev/null 2>&1 && DAY=$1
 
 [ "$AOC_SESSION_COOKIE" = "" ] && echo "\$AOC_SESSION_COOKIE not set" && exit 1
-curl -i https://adventofcode.com/2022/day/$DAY/input --cookie "session=$AOC_SESSION_COOKIE" -o day`printf "%02d" $DAY`/input
+curl -s https://adventofcode.com/2022/day/$DAY/input --cookie "session=$AOC_SESSION_COOKIE" -o day`printf "%02d" $DAY`/input