implemented day 2 in rust

rust/adventOfCode/Cargo.lock

@@ -5,3 +5,50 @@ version = 3
 [[package]]
 name = "advent_of_code"
 version = "0.1.0"
+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "memchr"
+version = "2.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+
+[[package]]
+name = "regex"
+version = "1.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"

rust/adventOfCode/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+regex = "1.10.2"

rust/adventOfCode/src/day2/cube_set.rs

@@ -0,0 +1,47 @@
+use std::fmt;
+
+#[derive(PartialEq, Eq)]
+pub enum CubeColor {
+    BLUE,
+    RED,
+    GREEN,
+}
+pub struct CubeSet {
+    pub quantity: u32,
+    pub colour: CubeColor
+}
+
+// This is currently unused as it was only for debugging.
+impl fmt::Display for CubeSet {
+    fn fmt(&self, f:&mut fmt::Formatter) -> fmt::Result{
+        let cube_color = match self.colour{
+            CubeColor::GREEN => "green",
+            CubeColor::BLUE => "blue",
+            CubeColor::RED => "red"
+        };
+        write!(f, "Cube color: {}, quantity: {}", cube_color, self.quantity)
+    }
+}
+
+impl CubeSet {
+    // The constructor expects a string that looks like
+    // Number Color, f.ex 3 blue, or 20 red
+    pub fn new(input: &String)-> Self{
+        let tokens: Vec<&str> = input.split_whitespace().collect();
+
+        CubeSet {
+            quantity:match tokens[0].parse(){
+                Ok(digit) => digit,
+                _=> panic!("Found no number in the CubeSet Constructor")
+            },
+            colour:match tokens[1]{
+                "red" => CubeColor::RED,
+                "blue" => CubeColor::BLUE,
+                "green" => CubeColor::GREEN,
+                _ => panic!("Found no colour in the CubeSet Constructor")
+            } }
+     }
+
+}
+
+

rust/adventOfCode/src/day2/game.rs

@@ -0,0 +1,31 @@
+use crate::day2::cube_set::CubeSet;
+
+pub struct Game {
+    pub id: i32,
+    pub draws: Vec<CubeSet>
+}
+
+impl Game {
+    pub fn new(input: &str)-> Self{
+        let tokens = input.split(":").collect::<Vec<&str>>();
+        // The first token looks like: Game N, where N is the game number
+        let game_number_string = tokens[0].split_whitespace().collect::<Vec<&str>>()[1];
+        let parsed_game_id: i32 = match game_number_string.to_string().parse(){
+                Ok(digit) => digit,
+                Err(_)=> panic!("Found no number parsing Game Id")
+            };
+        let draws = Self::parse_draws(tokens[1]);
+
+        Game { id: parsed_game_id, draws }
+    }
+    fn parse_draws(input: &str)-> Vec::<CubeSet>{
+        let mut return_vec = Vec::<CubeSet>::new();
+
+        let comma_and_semicolon = regex::Regex::new(r",|;").unwrap();
+        for draw_string in comma_and_semicolon.split(input){
+            return_vec.push(CubeSet::new(&draw_string.to_string()));
+        };
+
+        return_vec
+    }
+}

rust/adventOfCode/src/day2/mod.rs

@@ -0,0 +1,79 @@
+use std::fs;
+use cube_set::{CubeColor, CubeSet};
+use game::Game;
+
+mod cube_set;
+mod game;
+
+pub fn run_day2(){
+
+    println!("Pls implement me");
+    let contents = fs::read_to_string("input2.txt")
+        .expect("Could not find the file");
+    
+    let possible_games_sum = part_one(&contents);
+    println!("The answer to the first part of day2 is: {possible_games_sum}");
+    let minimum_powers = part_two(&contents);
+    println!("The answer to the second part of day2 is: {minimum_powers}");
+
+}
+
+fn part_one(contents: &String)-> i32{
+    let game_rules = [
+        CubeSet{ quantity: 12, colour: CubeColor::RED},
+        CubeSet{quantity: 13, colour: CubeColor::GREEN},
+        CubeSet{quantity: 14, colour:CubeColor::BLUE}];
+    let mut possible_games_sum = 0;
+
+    for line in contents.lines() {
+
+        if !line.is_empty(){
+            let current_game =  Game::new(line);
+            let mut possible_game = true;
+
+            for draw in current_game.draws{
+                let applicable_rule_set = game_rules.iter().find(|rule_set| rule_set.colour == draw.colour).unwrap();
+
+                if applicable_rule_set.quantity < draw.quantity{
+                    possible_game = false;
+                }
+            }
+            if possible_game{
+                possible_games_sum += current_game.id;
+            }
+        }
+    }
+    possible_games_sum
+}
+
+fn part_two(contents: &String)-> u32{
+    let mut games_power = 0;
+
+    for line in contents.lines(){
+        if !line.is_empty(){
+            let current_game = Game::new(line);
+            let mut minimum_viable_cubeset = [
+                CubeSet{ quantity: 0, colour: CubeColor::RED}, 
+                CubeSet{ quantity: 0, colour: CubeColor::GREEN},
+                CubeSet{ quantity: 0, colour: CubeColor::BLUE}];
+
+            for draw in current_game.draws{
+                let matching_color_set: &mut CubeSet = minimum_viable_cubeset.iter_mut().find(|color_set| color_set.colour == draw.colour).unwrap();
+
+                if matching_color_set.quantity < draw.quantity {
+                    *matching_color_set = CubeSet{quantity: draw.quantity, colour: draw.colour};
+                }
+            }
+            let mut accumulator = 1;
+
+            for minimum_set in minimum_viable_cubeset.iter(){
+                accumulator *= minimum_set.quantity;
+            }
+            games_power += accumulator;
+        }
+    }
+    games_power
+}
+
+
+

rust/adventOfCode/src/main.rs

@@ -1,8 +1,7 @@
-
 mod day1;
+mod day2;
 
 fn main() {
-    day1::run_day1()
+    day1::run_day1();
+    day2::run_day2();
 }
-
-