feat: day3

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

.gitlab-ci.yml

@@ -13,3 +13,8 @@ day-2:
   stage: build
   script:
     - cd day2; cargo run --release ./input
+
+day-3:
+  stage: build
+  script:
+    - cd day3; cargo run --release ./input

day3/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day3/input

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day3/src/main.rs

@@ -0,0 +1,69 @@
+use std::{fs, env, collections::HashSet, vec};
+
+
+fn read_input(path: &str) -> String {
+    return fs::read_to_string(path).expect("Cannot read file.");
+}
+
+fn parse_input_part1(s: &str) -> Vec<(HashSet<char>, HashSet<char>)> {
+    return s.lines().into_iter().fold(vec![], |mut acc, x| {
+        let tuple = x.split_at(x.len() / 2);
+        acc.push((tuple.0.chars().collect(), tuple.1.chars().collect()));
+        return acc;
+    });
+}
+
+fn get_intersections_2(v: &Vec<(HashSet<char>, HashSet<char>)>) -> Vec<char> {
+    return v.iter()
+        .map(|t| 
+            t.0.intersection(&t.1).collect::<Vec<&char>>())
+        .flatten()
+        .map(|c| c.to_owned())
+        .collect();
+}
+
+
+fn parse_input_part2(s: &str) -> Vec<(HashSet<char>, HashSet<char>, HashSet<char>)> {
+    let mut ret = vec![];
+    let mut iter = s.lines().into_iter();
+    loop {
+        let (a, b, c) = (iter.next(), iter.next(), iter.next());
+        if a.is_none() {
+            break;
+        }
+        ret.push((
+            a.unwrap().chars().collect(),
+            b.unwrap().chars().collect(),
+            c.unwrap().chars().collect()
+        ))
+    }
+    return ret;
+}
+
+fn get_intersections_3(v: &Vec<(HashSet<char>, HashSet<char>, HashSet<char>)>) -> Vec<char> {
+    return v.iter()
+        .map(|t| {
+            let first = t.0.intersection(&t.1).map(|c| c.to_owned()).collect::<HashSet<char>>();
+            return first.intersection(&t.2).map(|c| c.to_owned()).collect::<Vec<char>>();
+        })
+        .flatten()
+        .collect();
+}
+
+fn get_priority(c: &char) -> u32 {
+    return *c as u32 - if c.is_uppercase() { 'A' as u32 - 27 } else { 'a' as u32 - 1 } ;
+}
+
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args.iter().skip(1) {
+        println!("[{}]", &arg);
+        let vec_in_part1 = parse_input_part1(&read_input(&arg));
+        let vec_in_part2 = parse_input_part2(&read_input(&arg));
+        let prio_sum_part1 = get_intersections_2(&vec_in_part1).iter().map(|x| get_priority(x)).sum::<u32>();
+        let prio_sum_part2 = get_intersections_3(&vec_in_part2).iter().map(|x| get_priority(x)).sum::<u32>();
+        println!("\t[Part 1] => Answer is '{}'.", prio_sum_part1);
+        println!("\t[Part 2] => Answer is '{}'.", prio_sum_part2);
+    }
+}