day 2

2022/02/rust/main.rs

@@ -0,0 +1,129 @@
+#![feature(test)]
+
+extern crate test;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use test::Bencher;
+
+    #[bench]
+    fn bench_a(b: &mut Bencher) {
+        b.iter(|| part_a(INPUT));
+    }
+
+    #[bench]
+    fn bench_a_old(b: &mut Bencher) {
+        b.iter(|| part_a_old(INPUT));
+    }
+
+    #[bench]
+    fn bench_b(b: &mut Bencher) {
+        b.iter(|| part_b(INPUT));
+    }
+}
+
+const TEST: &str = include_str!("../test.txt");
+const INPUT: &str = include_str!("../input.txt");
+
+#[derive(Debug, Clone, Copy)]
+enum Type {
+    Rock = 1,
+    Paper = 2,
+    Scissor = 3,
+}
+
+#[derive(Debug)]
+struct Game(Type, Type);
+
+impl Game {
+    fn score(&self) -> u32 {
+        let mut total = self.0 as u32;
+        // Result will be: 0=draw 1=win 2=loss
+        let result = (self.0 as i8 - self.1 as i8).rem_euclid(3) as u8;
+        total += match result {
+            1 => 6,
+            0 => 3,
+            _ => 0,
+        };
+        total
+    }
+}
+
+fn part_a_old(input: &str) {
+    let result = input
+        .trim()
+        .lines()
+        .map(|line| {
+            let opponent: Type = match line.chars().nth(0).unwrap() {
+                'A' => Type::Rock,
+                'B' => Type::Paper,
+                'C' => Type::Scissor,
+                _ => panic!("unkown input"),
+            };
+            let me = match line.chars().nth(2).unwrap() {
+                'X' => Type::Rock,
+                'Y' => Type::Paper,
+                'Z' => Type::Scissor,
+                _ => panic!("unkown input"),
+            };
+            let g: Game = Game(me, opponent);
+            g.score()
+        })
+        .sum::<u32>();
+    println!("A: {:?}", result);
+}
+
+fn part_a(input: &str) {
+    let result = input
+        .trim()
+        .lines()
+        .map(|line| {
+            let bytes = line.as_bytes();
+            let opponent = bytes[0] - b'A';
+            let me: u8 = bytes[2] - b'X';
+
+            let total = me + 1;
+            // Result will be: 0=draw 1=win 2=loss
+            let result = (me as i8 - opponent as i8).rem_euclid(3);
+            let score = match result {
+                1 => 6,
+                0 => 3,
+                _ => 0,
+            };
+            (total + score) as u16
+        })
+        .sum::<u16>();
+    println!("{}", result);
+}
+
+fn part_b(input: &str) {
+    let result = input
+        .trim()
+        .lines()
+        .map(|line| {
+            let bytes = line.as_bytes();
+            let opponent = bytes[0] - 'A' as u8;
+            let result: u8 = bytes[2] - 'X' as u8;
+
+            let total: u8 = match result {
+                1 => 3,
+                2 => 6,
+                _ => 0,
+            };
+            let me = (opponent + result + 2).rem_euclid(3);
+            (total + me + 1) as u16
+        })
+        .sum::<u16>();
+    println!("{}", result);
+}
+
+fn main() {
+    println!("Part A:");
+    part_a(TEST);
+    part_a(INPUT);
+
+    println!("\nPart B:");
+    part_b(TEST);
+    part_b(INPUT);
+}

Cargo.toml

@@ -10,4 +10,8 @@ edition = "2021"
 name = "2022-01"
 path = "./2022/01/rust/main.rs"
 
+[[bin]]
+name = "2022-02"
+path = "./2022/02/rust/main.rs"
+
 # INJECT HERE