day03

Author: scriptonist

day03/Cargo.toml

@@ -0,0 +1,8 @@
+[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]

day03/src/input.txt

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day03/src/main.rs

@@ -0,0 +1,73 @@
+use std::collections::{HashMap, HashSet};
+
+fn main() {
+    let input = include_str!("./input.txt");
+    println!("{}", p1(input));
+    println!("{}", p2(input));
+}
+
+fn p2(input: &str) -> u32 {
+    let sacks = input.lines().collect::<Vec<&str>>();
+    let mut total = 0;
+    for group in sacks.chunks(3) {
+        let mut count: HashMap<char, i32> = HashMap::new();
+        for sack in group {
+            let mut visited: HashSet<char> = HashSet::new();
+            for char in sack.chars() {
+                if !visited.contains(&char) {
+                    visited.insert(char);
+                    *count.entry(char).or_default() += 1;
+                }
+            }
+        }
+        for (k, v) in count {
+            if v == 3 {
+                total += get_priority(k);
+            }
+        }
+    }
+
+    total
+}
+
+fn p1(input: &str) -> u32 {
+    let mut s = 0;
+    for line in input.lines() {
+        let (first, second) = line.split_at(line.len() / 2);
+        let mut visited: HashSet<char> = HashSet::new();
+        for c in first.chars() {
+            if visited.contains(&c) {
+                continue;
+            }
+            if let Some(_) = second.find(c) {
+                println!("{} {}", c, get_priority(c));
+                s += get_priority(c);
+                break;
+            }
+            visited.insert(c);
+        }
+    }
+    s
+}
+fn get_priority(c: char) -> u32 {
+    if c.is_lowercase() {
+        return 26 - (122 - c as u32);
+    }
+
+    52 - (90 - c as u32)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::get_priority;
+
+    #[test]
+    fn can_get_code() {
+        assert_eq!(get_priority('a'), 1);
+        assert_eq!(get_priority('b'), 2);
+        assert_eq!(get_priority('z'), 26);
+        assert_eq!(get_priority('A'), 27);
+        assert_eq!(get_priority('B'), 28);
+        assert_eq!(get_priority('Z'), 52);
+    }
+}