y2015d16

y2015/src/bin/d16.rs

@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2015::days::d16;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/16_input.txt")).unwrap();
+    println!("{}", d16::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/16_input.txt")).unwrap();
+    println!("{}", d16::process_part2(&content));
+}

y2015/src/days/d16.rs

@@ -0,0 +1,74 @@
+use std::collections::HashMap;
+
+const TAPE: &str = "children: 3
+cats: 7
+samoyeds: 2
+pomeranians: 3
+akitas: 0
+vizslas: 0
+goldfish: 5
+trees: 3
+cars: 2
+perfumes: 1";
+
+pub fn process_part1(input: &str) -> String {
+    let mut tape = HashMap::new();
+    TAPE.lines().for_each(|line| {
+        let (k, v) = line.split_once(": ").unwrap();
+        tape.insert(k, v.parse::<u32>().unwrap());
+    });
+    for line in input.lines() {
+        let (sue, params) = line.split_once(": ").unwrap();
+        let mut is_correct = true;
+        params.split(", ").for_each(|param| {
+            let (k, v) = param.split_once(": ").unwrap();
+            if v.parse::<u32>().unwrap() != *tape.get(k).unwrap() {
+                is_correct = false;
+            }
+        });
+        if is_correct {
+            return sue.to_string();
+        }
+    }
+    "".to_string()
+}
+
+pub fn process_part2(input: &str) -> String {
+    let mut tape = HashMap::new();
+    TAPE.lines().for_each(|line| {
+        let (k, v) = line.split_once(": ").unwrap();
+        tape.insert(k, v.parse::<u32>().unwrap());
+    });
+    for line in input.lines() {
+        let (sue, params) = line.split_once(": ").unwrap();
+        let mut is_correct = true;
+        params.split(", ").for_each(|param| {
+            let (k, v) = param.split_once(": ").unwrap();
+            let v = v.parse::<u32>().unwrap();
+            let tape_value = *tape.get(k).unwrap();
+            if (["cats", "trees"].contains(&k) && v <= tape_value)
+                || (["pomeranians", "goldfish"].contains(&k) && v >= tape_value)
+                || (!["cats", "trees", "pomeranians", "goldfish"].contains(&k) && v != tape_value)
+            {
+                is_correct = false;
+            }
+        });
+        if is_correct {
+            return sue.to_string();
+        }
+    }
+    "".to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "{{EXAMPLE}}";
+
+    #[test]
+    fn part2() {
+        let result = process_part2(INPUT);
+        assert_eq!(result, 0);
+    }
+}

y2015/src/days/mod.rs

@@ -13,3 +13,5 @@ pub mod d6;
 pub mod d7;
 pub mod d8;
 pub mod d9;
+
+pub mod d16;