Day 3

Cargo.lock

@@ -3,5 +3,5 @@
 version = 3
 
 [[package]]
-name = "advent_of_code2022"
+name = "advent-of-code-2022"
 version = "0.1.0"

res/03/input.txt

@@ -0,0 +1,300 @@
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src/d03.rs

@@ -0,0 +1,104 @@
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::fs;
+
+pub fn d03() {
+    let path = "res/03/input.txt";
+
+    let contents = fs::read_to_string(path).expect("Should have been able to read the file");
+
+    let cont_arr = contents.split("\n");
+
+    // build alphabet as hashmap
+    let mut alphabet = HashMap::<char, i32>::new();
+    let alphabet_chars: Vec<char> = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        .chars()
+        .collect();
+
+    alphabet_chars.iter().enumerate().for_each(|(i, a)| {
+        alphabet.insert(*a, (i + 1) as i32);
+    });
+
+    // parse rucksacks into 2d i32 vec
+    let rucksacks: Vec<Vec<i32>> = cont_arr
+        .into_iter()
+        .filter(|line| *line != "") // filter out empty lines
+        .map(|line| {
+            line.chars()
+                .into_iter()
+                .map(|c| *(alphabet.get(&c).unwrap()))
+                .collect()
+        })
+        .collect();
+
+    // 1st task
+    // calculate results - split each rucksack in half and find & sum up duplicates between halves
+    let results: Vec<i32> = rucksacks
+        .iter()
+        .map(|r| {
+            let (r1, r2) = r.split_at(r.len() / 2);
+            return first_duplicate_value(&r1.to_vec(), &r2.to_vec());
+        })
+        .collect();
+
+    let result: i32 = results.iter().sum();
+
+    println!("Result 1: {}", result);
+
+
+    // 2nd task
+    // calculate results - find duplicates in each 3-rucksack groups and sum up
+    let mut result = 0;
+    for i in 0..rucksacks.len()/3 {
+        result += first_triplicate_value(
+            &rucksacks[i*3],
+            &rucksacks[i*3 + 1],
+            &rucksacks[i*3 + 2]
+        );
+    }
+
+    println!("Result 2: {}", result);
+}
+
+// returns first duplicate value of 2 vecs or 0
+fn first_duplicate_value(vec1: &Vec<i32>, vec2: &Vec<i32>) -> i32 {
+    let mut vec_set = HashSet::<i32>::new();
+    let mut res = 0;
+
+    vec1.iter().for_each(|i| {
+        vec_set.insert(*i);
+    });
+
+    vec2.iter().for_each(|i| {
+        if vec_set.contains(i) {
+            res = *i;
+            return;
+        }
+    });
+
+    res
+}
+
+// returns first duplicate value of 3 vecs or 0
+fn first_triplicate_value(vec1: &Vec<i32>, vec2: &Vec<i32>, vec3: &Vec<i32>) -> i32 {
+    let mut vec_set1 = HashSet::<i32>::new();
+    let mut vec_set2 = HashSet::<i32>::new();
+    let mut res = 0;
+
+    vec1.iter().for_each(|i| {
+        vec_set1.insert(*i);
+    });
+    
+    vec2.iter().for_each(|i| {
+        vec_set2.insert(*i);
+    });
+
+    vec3.iter().for_each(|i| {
+        if vec_set1.contains(i) && vec_set2.contains(i) {
+            res = *i;
+            return;
+        }
+    });
+
+    res
+}

src/main.rs

@@ -1,5 +1,5 @@
-mod d02;
+mod d03;
 
 fn main() {
-    d02::d02();
+    d03::d03();
 }