Day 3 + I formatted everything by accident lol

src/day1/mod.rs

@@ -2,7 +2,7 @@ use crate::utils::Day;
 
 #[derive(Debug, Default)]
 pub struct Day1 {
-    pub input: String
+    pub input: String,
 }
 
 impl Day for Day1 {
@@ -10,12 +10,20 @@ impl Day for Day1 {
         let mut values = Vec::<usize>::new();
 
         for line in self.input.lines() {
-            let digits = line.chars().filter(|char| char.is_numeric()).collect::<Vec<_>>();
+            let digits = line
-            let calibrartion_value = format!("{}{}", digits.first().unwrap(), digits.last().unwrap());
+                .chars()
+                .filter(|char| char.is_numeric())
+                .collect::<Vec<_>>();
+            let calibrartion_value =
+                format!("{}{}", digits.first().unwrap(), digits.last().unwrap());
             values.push(calibrartion_value.parse().unwrap());
         }
 
-        return values.into_iter().reduce(|acc, e| acc + e).unwrap().to_string();
+        return values
+            .into_iter()
+            .reduce(|acc, e| acc + e)
+            .unwrap()
+            .to_string();
     }
 
     fn part2(&mut self) -> String {
@@ -44,7 +52,8 @@ impl Day for Day1 {
                 line.match_indices("7").collect::<Vec<_>>(),
                 line.match_indices("8").collect::<Vec<_>>(),
                 line.match_indices("9").collect::<Vec<_>>(),
-            ].into_iter();
+            ]
+            .into_iter();
 
             let mut flat = Vec::<(usize, String)>::new();
             for digit in digits {
@@ -66,10 +75,15 @@ impl Day for Day1 {
             }
             flat.sort_by(|a, b| a.0.cmp(&b.0));
 
-            let calibration_value = format!("{}{}", flat.first().unwrap().1, flat.last().unwrap().1);
+            let calibration_value =
+                format!("{}{}", flat.first().unwrap().1, flat.last().unwrap().1);
             values.push(calibration_value.parse().unwrap());
         }
 
-        return values.into_iter().reduce(|acc, e| acc + e).unwrap().to_string();
+        return values
+            .into_iter()
+            .reduce(|acc, e| acc + e)
+            .unwrap()
+            .to_string();
     }
 }

src/day2/mod.rs

@@ -5,20 +5,20 @@ use crate::utils::Day;
 #[derive(Debug, Default)]
 pub struct Day2 {
     pub input: String,
-    pub games: Vec<Game>
+    pub games: Vec<Game>,
 }
 
 #[derive(Debug)]
 pub struct Game {
     id: usize,
-    picks: Vec<CubeCombo>
+    picks: Vec<CubeCombo>,
 }
 
 #[derive(Debug)]
 struct CubeCombo {
     red: usize,
     blue: usize,
-    green: usize
+    green: usize,
 }
 
 impl Day for Day2 {
@@ -33,7 +33,7 @@ impl Day for Day2 {
             let captures = game_re.captures(&line).unwrap();
             let mut game = Game {
                 id: captures.get(1).unwrap().as_str().parse().unwrap(),
-                picks: vec![]
+                picks: vec![],
             };
             let picks = captures.get(2).unwrap().as_str().split("; ");
             for pick in picks {
@@ -46,7 +46,7 @@ impl Day for Day2 {
                 let mut pick = CubeCombo {
                     red: 0,
                     blue: 0,
-                    green: 0
+                    green: 0,
                 };
 
                 for capture in captures.iter().filter(|e| e.is_some()).map(|e| e.unwrap()) {
@@ -55,7 +55,7 @@ impl Day for Day2 {
                         "red" => pick.red = split[0].parse().unwrap(),
                         "blue" => pick.blue = split[0].parse().unwrap(),
                         "green" => pick.green = split[0].parse().unwrap(),
-                        _ => panic!("impossible wtf")
+                        _ => panic!("impossible wtf"),
                     }
                 }
 
@@ -68,11 +68,14 @@ impl Day for Day2 {
 
     fn part1(&mut self) -> String {
         // Sum the illegal game IDs
-        let sum = self.games
+        let sum = self
+            .games
             .iter()
-            .filter(|g| 
+            .filter(|g| {
-                g.picks.iter().all(|pick| pick.red <= 12 && pick.blue <= 14 && pick.green <= 13 )
+                g.picks
-            )
+                    .iter()
+                    .all(|pick| pick.red <= 12 && pick.blue <= 14 && pick.green <= 13)
+            })
             .fold(0, |acc, e| acc + e.id);
 
         sum.to_string()
@@ -80,27 +83,31 @@ impl Day for Day2 {
 
     fn part2(&mut self) -> String {
         // Calculate the least amount of dice possible for all games
-        let sum = self.games.iter().map(|game| {
+        let sum = self
-            let mut combo = CubeCombo {
+            .games
-                red: 0,
+            .iter()
-                green: 0,
+            .map(|game| {
-                blue: 0
+                let mut combo = CubeCombo {
-            };
+                    red: 0,
+                    green: 0,
+                    blue: 0,
+                };
 
-            for pick in &game.picks {
+                for pick in &game.picks {
-                if combo.red < pick.red {
+                    if combo.red < pick.red {
-                    combo.red = pick.red;
+                        combo.red = pick.red;
+                    }
+                    if combo.green < pick.green {
+                        combo.green = pick.green;
+                    }
+                    if combo.blue < pick.blue {
+                        combo.blue = pick.blue;
+                    }
                 }
-                if combo.green < pick.green {
-                    combo.green = pick.green;
-                }
-                if combo.blue < pick.blue {
-                    combo.blue = pick.blue;
-                }
-            }
 
-            combo
+                combo
-        }).fold(0, |acc, combo| acc + (combo.red * combo.blue * combo.green));
+            })
+            .fold(0, |acc, combo| acc + (combo.red * combo.blue * combo.green));
 
         sum.to_string()
     }

src/day3/mod.rs

@@ -0,0 +1,155 @@
+use std::collections::HashMap;
+
+use regex::Regex;
+
+use crate::utils::Day;
+
+#[derive(Debug)]
+pub struct Day3 {
+    pub input: String,
+}
+
+impl Day for Day3 {
+    fn part1(&mut self) -> String {
+        let number_re = Regex::new(r"\d+").unwrap();
+        let line_length = self.input.split('\n').next().unwrap().len() + 1;
+        let mut valid = Vec::<usize>::new();
+
+        for number in number_re.find_iter(&self.input) {
+            let mut checks = vec![];
+            if number.start() % line_length != 0 {
+                checks.push(number.start() - 1)
+            }
+            checks.push(number.end());
+            checks.append(
+                &mut ((number.start().checked_sub(1).unwrap_or(number.start()))..=(number.end()))
+                    .flat_map(|i| {
+                        let mut checks = vec![];
+                        if number.start() / line_length != 0 {
+                            checks.push(i - line_length)
+                        }
+                        if number.start() / line_length != self.input.len() / line_length {
+                            checks.push(i + line_length)
+                        }
+                        checks
+                    })
+                    .collect::<Vec<_>>(),
+            );
+
+            for check in checks {
+                if self
+                    .input
+                    .chars()
+                    .nth(check)
+                    .is_some_and(|character| character != '.' && character.is_ascii_punctuation())
+                {
+                    valid.push(number.as_str().parse().unwrap());
+                    break;
+                }
+            }
+        }
+
+        valid.iter().sum::<usize>().to_string()
+    }
+
+    fn part2(&mut self) -> String {
+        let number_re = Regex::new(r"\d+").unwrap();
+        let line_length = self.input.split('\n').next().unwrap().len() + 1;
+        let mut valid /* (number, gear_index) */ = Vec::<(usize, usize)>::new();
+
+        for number in number_re.find_iter(&self.input) {
+            let mut checks = vec![];
+            if number.start() % line_length != 0 {
+                checks.push(number.start() - 1)
+            }
+            checks.push(number.end());
+            checks.append(
+                &mut ((number.start().checked_sub(1).unwrap_or(number.start()))..=(number.end()))
+                    .flat_map(|i| {
+                        let mut checks = vec![];
+                        if number.start() / line_length != 0 {
+                            checks.push(i - line_length)
+                        }
+                        if number.start() / line_length != self.input.len() / line_length {
+                            checks.push(i + line_length)
+                        }
+                        checks
+                    })
+                    .collect::<Vec<_>>(),
+            );
+
+            for check in checks {
+                if self
+                    .input
+                    .chars()
+                    .nth(check)
+                    .is_some_and(|character| character == '*')
+                {
+                    valid.push((number.as_str().parse().unwrap(), check));
+                    break;
+                }
+            }
+        }
+
+        let mut gear_map = HashMap::<usize, Vec<usize>>::new();
+        for (number, gear_index) in valid {
+            match gear_map.get_mut(&gear_index) {
+                Some(value) => value.push(number),
+                None => {
+                    gear_map.insert(gear_index, vec![number]);
+                }
+            }
+        }
+
+        gear_map
+            .iter()
+            .map(|(_, numbers)| match numbers.len() {
+                2 => numbers[0] * numbers[1],
+                _ => 0,
+            })
+            .sum::<usize>()
+            .to_string()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{day3::Day3, utils::Day};
+
+    #[test]
+    fn passes_example_1() {
+        dbg!(Day3 {
+            input: r#"467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598.."#
+                .to_string(),
+        }
+        .solve(1));
+    }
+
+    #[test]
+    fn passes_example_2() {
+        dbg!(Day3 {
+            input: r#"467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
+"#
+            .to_string(),
+        }
+        .solve(2));
+    }
+}

src/main.rs

@@ -1,12 +1,16 @@
-use std::{io::Write, time::{Duration, Instant}};
+use std::{
+    io::Write,
+    time::{Duration, Instant},
+};
 
 use clap::{Parser, Subcommand};
 
-use crate::{day1::Day1, day2::Day2, utils::Day};
+use crate::{day1::Day1, day2::Day2, day3::Day3, utils::Day};
 
-pub mod utils;
 pub mod day1;
 pub mod day2;
+pub mod day3;
+pub mod utils;
 
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
@@ -16,7 +20,7 @@ struct Cli {
     auth: String,
     /// The subcommand to run
     #[command(subcommand)]
-    subcommand: Subcommands
+    subcommand: Subcommands,
 }
 
 #[derive(Subcommand)]
@@ -26,7 +30,7 @@ enum Subcommands {
         /// The day to solve for
         day: u8,
         /// The part to solve for
-        part: u8
+        part: u8,
     },
     /// Runs solution N amount of times, averaging speed
     Benchmark {
@@ -37,13 +41,13 @@ enum Subcommands {
         /// The amount of times to run before actually keeping track
         warmup: u32,
         /// The amount of times to run
-        n: u32
+        n: u32,
     },
     /// Fetches and prints the given input for a specified day
     Input {
         /// The day to fetch
-        day: u8
+        day: u8,
-    }
+    },
 }
 
 #[tokio::main]
@@ -67,16 +71,25 @@ async fn main() {
 
             let mut day: Box<dyn Day> = match day {
                 1 => Box::new(Day1 { input: response }),
-                2 => Box::new(Day2 { input: response, games: vec![] }),
+                2 => Box::new(Day2 {
-                _ => panic!("Invalid day or part #")
+                    input: response,
+                    games: vec![],
+                }),
+                3 => Box::new(Day3 { input: response }),
+                _ => panic!("Invalid day #"),
             };
             let start = std::time::Instant::now();
             let result = day.solve(part);
             let end = std::time::Instant::now();
             println!("Solution: {result}");
             println!("Solved in {}ns", (end - start).as_nanos() as f64 / 1000.0);
-        },
+        }
-        Subcommands::Benchmark { day, part, warmup, n } => {
+        Subcommands::Benchmark {
+            day,
+            part,
+            warmup,
+            n,
+        } => {
             let response = client
                 .get(format!("https://adventofcode.com/2023/day/{day}/input"))
                 .header("Cookie", format!("session={auth}", auth = cli.auth))
@@ -91,8 +104,12 @@ async fn main() {
 
             let mut day: Box<dyn Day> = match day {
                 1 => Box::new(Day1 { input: response }),
-                2 => Box::new(Day2 { input: response, games: vec![] }),
+                2 => Box::new(Day2 {
-                _ => panic!("Invalid day #")
+                    input: response,
+                    games: vec![],
+                }),
+                3 => Box::new(Day3 { input: response }),
+                _ => panic!("Invalid day #"),
             };
             let mut timings = Vec::<Duration>::new();
             for _ in 1..warmup {
@@ -111,7 +128,7 @@ async fn main() {
             }
             let avg = timings.into_iter().sum::<Duration>() / n;
             println!("\nAverage timing: {}µs", avg.as_nanos() as f64 / 1000.0);
-        },
+        }
         Subcommands::Input { day } => {
             let response = client
                 .get(format!("https://adventofcode.com/2023/day/{day}/input"))
@@ -126,6 +143,6 @@ async fn main() {
                 .to_owned();
 
             println!("{response}");
-        },
+        }
     }
 }

src/utils.rs

@@ -1,13 +1,13 @@
 pub trait Day: std::fmt::Debug {
     fn part1(&mut self) -> String;
     fn part2(&mut self) -> String;
-    fn parse(&mut self) {  }
+    fn parse(&mut self) {}
     fn solve(&mut self, part: u8) -> String {
         self.parse();
         match part {
             1 => self.part1(),
             2 => self.part2(),
-            _ => panic!("Invalid part #")
+            _ => panic!("Invalid part #"),
         }
     }
 }