Upload day03

.gitignore

@@ -0,0 +1,2 @@
+target
+

README.md

@@ -6,7 +6,7 @@ These are my attempts on [AoC 2022](https://adventofcode.com/2022/)
 |--------------|--------|--------|----------|
 | [01](day01)  |   ⭐   |   ⭐   | Python   |
 | [02](day02)  |   ⭐   |   ⭐   | C        |
-| 03           |        |        |          |
+| [03](day03)  |   ⭐   |   ⭐   | Rust     |
 | 04           |        |        |          |
 | 05           |        |        |          |
 | 06           |        |        |          |

day03/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day03"
+version = "0.1.0"

day03/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "day03"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[[bin]]
+name = "day03"
+path = "main.rs"

day03/input.txt

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day03/input_demo.txt

@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
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+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw

day03/main.rs

@@ -0,0 +1,100 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, prelude::*, BufReader};
+
+fn main() -> io::Result<()> {
+    // Usage: cargo run -- <input file>
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        println!("Usage: {} <file>", args[0]);
+        return Ok(());
+    }
+
+    let file = File::open(&args[1])?;
+    let reader = BufReader::new(file);
+
+    // Could use lines().collect() directly for a Vec<Result<String, Error>>
+    let lines: Vec<String> = reader.lines().map(|l| l.expect("Could not parse line")).collect();
+
+    part1(&lines).unwrap();
+    part2(&lines).unwrap();
+
+    Ok(())
+}
+
+fn part1(lines: &Vec<String>) -> io::Result<()> {
+    // All misplaced characters, one char per line of input
+    let mut misplaced = "".to_string();
+
+    for line in lines {
+        let (left, right) = line.split_at(line.len() / 2);
+
+        // Find the character that occurs in both halves
+        for c in left.chars() {
+            if right.contains(c) {
+                // The character exists in both halves.
+                misplaced.push(c);
+                break;
+            }
+        }
+    }
+
+    println!("== Part 1 ==");
+    println!("Misplaced characters: {}", misplaced);
+
+    let score = find_score(misplaced);
+
+    println!("Score: {}\n", score);
+
+    Ok(())
+}
+
+fn part2(lines: &Vec<String>) -> io::Result<()> {
+    let mut badges = "".to_string();
+
+    let mut chunk = Vec::new();
+    for line in lines {
+        let line = line;
+        chunk.push(line);
+
+        // After reading 3 lines, find the recurring character and clear the chunk
+        if chunk.len() == 3 {
+            for c in chunk[0].chars() {
+                if chunk[1].contains(c) && chunk[2].contains(c) {
+                    // The character exists in all 3 lines.
+                    badges.push(c);
+                    break;
+                }
+            }
+
+            chunk = Vec::new();
+        }
+    }
+
+    println!("== Part 2 ==");
+    println!("Badges: {}", badges);
+
+    let score = find_score(badges);
+    
+    println!("Score: {}\n", score);
+
+    Ok(())
+}
+
+fn find_score(badges: String) -> u32 {
+    // Returns the sum of points.
+    // Lower case letters are mapped a-z -> 1-26
+    // Upper case letters are mapped A-Z -> 27-52
+
+    let mut score = 0;
+
+    for c in badges.chars() {
+        if c.is_uppercase() {
+            score += (c as u8 - b'A') as u32 + 27;
+        } else {
+            score += (c as u8 - b'a') as u32 + 1;
+        }
+    }
+
+    score
+}