Day 01 optimization + Day02

src/day01.rs

@@ -3,7 +3,15 @@ use std::cmp::Reverse;
 use aoc_runner_derive::{aoc, aoc_generator};
 #[aoc_generator(day1)]
 pub fn input_generator(input: &str) -> Vec<usize> {
-    input.split("\n\n").map(|chunk| chunk.lines().map(|line| line.trim().parse::<usize>().unwrap()).sum()).collect()
+    input
+        .split("\n\n")
+        .map(|chunk| {
+            chunk
+                .lines()
+                .map(|line| line.trim().parse::<usize>().unwrap())
+                .sum()
+        })
+        .collect()
 }
 
 #[aoc(day1, part1)]

src/day02.rs

@@ -0,0 +1,131 @@
+use std::str::FromStr;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Choice {
+    Rock,
+    Paper,
+    Scissors,
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Outcome {
+    Win,
+    Loose,
+    Draw,
+}
+
+
+impl Outcome {
+    fn other(&self, choice: &Choice) -> Choice {
+        match (self,choice) {
+            (Outcome::Win, Choice::Rock) => Choice::Paper,
+            (Outcome::Win, Choice::Paper) => Choice::Scissors,
+            (Outcome::Win, Choice::Scissors) => Choice::Rock,
+            (Outcome::Loose, Choice::Rock) => Choice::Scissors,
+            (Outcome::Loose, Choice::Paper) => Choice::Rock,
+            (Outcome::Loose, Choice::Scissors) => Choice::Paper,
+            (Outcome::Draw, other) => *other,
+        }
+    }
+}
+
+impl From<Outcome> for usize {
+    fn from(val: Outcome) -> Self {
+        match val {
+            Outcome::Win => 6,
+            Outcome::Loose => 0,
+            Outcome::Draw => 3,
+        }
+    }
+}
+
+impl From<&Choice> for Outcome {
+    fn from(value: &Choice) -> Self {
+        match value {
+            Choice::Rock => Outcome::Loose,
+            Choice::Paper => Outcome::Draw,
+            Choice::Scissors => Outcome::Win,
+        }
+    }
+}
+
+impl Choice {
+    fn shape_score(&self) -> usize {
+        match self {
+            Choice::Rock => 1,
+            Choice::Paper => 2,
+            Choice::Scissors => 3,
+        }
+    }
+    fn outcome(&self, other: &Self) -> Outcome {
+        match (self, other) {
+            (Choice::Rock, Choice::Scissors) => Outcome::Win,
+            (Choice::Paper, Choice::Rock) => Outcome::Win,
+            (Choice::Scissors, Choice::Paper) => Outcome::Win,
+            (Choice::Rock, Choice::Rock) => Outcome::Draw,
+            (Choice::Paper, Choice::Paper) => Outcome::Draw,
+            (Choice::Scissors, Choice::Scissors) => Outcome::Draw,
+            (Choice::Rock, Choice::Paper) => Outcome::Loose,
+            (Choice::Paper, Choice::Scissors) => Outcome::Loose,
+            (Choice::Scissors, Choice::Rock) => Outcome::Loose,
+        }
+    }
+}
+
+impl FromStr for Choice {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_ascii_uppercase().as_str() {
+            "A" | "X" => Ok(Self::Rock),
+            "B" | "Y" => Ok(Self::Paper),
+            "C" | "Z" => Ok(Self::Scissors),
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[aoc_generator(day2)]
+pub fn input_generator(input: &str) -> Vec<(Choice, Choice)> {
+    input
+        .lines()
+        .map(|line| {
+            let rule = line
+                .split_ascii_whitespace()
+                .map(|r| r.parse().unwrap())
+                .collect::<Vec<Choice>>();
+            (rule[0], rule[1])
+        })
+        .collect()
+}
+
+#[aoc(day2, part1)]
+pub fn solve_part1(input: &[(Choice, Choice)]) -> usize {
+    input
+        .iter()
+        .map(|(other, mine)| {
+            let shape_score = mine.shape_score();
+            let outcome: usize = mine.outcome(other).into();
+            shape_score + outcome
+        })
+        .sum()
+}
+
+
+
+
+#[aoc(day2, part2)]
+pub fn solve_part2(input: &[(Choice, Choice)]) -> usize {
+    input
+        .iter()
+        .map(|(other, goal)| {
+            let goal: Outcome = goal.into();
+            let mine = goal.other(other);
+            let shape_score = mine.shape_score();
+            let outcome: usize = goal.into();
+            shape_score + outcome
+        })
+        .sum()
+}

src/dayXX.rs

@@ -5,11 +5,11 @@ pub fn input_generator(input: &str) -> _ {
 }
 
 #[aoc(dayX, part1)]
-pub fn solve_part1(input: &[usize]) -> _ {
+pub fn solve_part1(input: &[usize]) -> usize {
     todo!()
 }
 
 // #[aoc(dayX, part2)]
-// pub fn solve_part2(input: &[usize]) -> _ {
+// pub fn solve_part2(input: &[usize]) -> usize {
 //     todo!()
 // }

src/lib.rs

@@ -1,4 +1,4 @@
-
 use aoc_runner_derive::aoc_lib;
 pub mod day01;
+pub mod day02;
 aoc_lib! { year = 2022 }