feat: implement day 09

src/day08.rs

@@ -79,7 +79,7 @@ fn solve_02(content: &str) -> anyhow::Result<u64> {
         });
     });
 
-    let mut keys = nodes.keys().filter(|key| key.ends_with("A")).map(|str| str.to_owned()).collect::<Vec<String>>();
+    let keys = nodes.keys().filter(|key| key.ends_with("A")).map(|str| str.to_owned()).collect::<Vec<String>>();
     //let end = nodes.keys().filter(|key| key.ends_with("Z")).map(|str| str.to_owned()).collect::<HashSet<String>>();
     let cmds = cmds.chars();
 

src/day09.rs

@@ -0,0 +1,134 @@
+use std::time::Instant;
+
+pub fn execute_task01(content: &str) {
+    let start = Instant::now();
+    let sum_of_b = solve_01(content).unwrap();
+    let duration = start.elapsed();
+
+    assert_eq!(1953784198, sum_of_b);
+    println!("Day09 - Task01 - Duration: {duration:?} - Sum of B: {}", sum_of_b)
+}
+
+pub fn execute_task02(content: &str) {
+    let start = Instant::now();
+    let command_steps = solve_02(content).unwrap();
+    let duration = start.elapsed();
+
+    assert_eq!(957, command_steps);
+    println!("Day09 - Task02 - Duration: {duration:?} - Sum of B: {}", command_steps)
+}
+
+fn solve_01(content: &str) -> anyhow::Result<i64> {
+    Ok(content
+        .lines()
+        .map(|line| line
+            .split(" ")
+            .map(|num| num.parse::<i64>().unwrap())
+            .collect::<Vec<i64>>())
+        .map(|data_line| build_tree(data_line))
+        .map(|tree| expand_tree_width_right(tree))
+        .map(|tree| tree.first().unwrap().last().unwrap().to_owned())
+        .sum())
+}
+
+fn solve_02(content: &str) -> anyhow::Result<i64> {
+    Ok(content
+        .lines()
+        .map(|line| line
+            .split(" ")
+            .map(|num| num.parse::<i64>().unwrap())
+            .collect::<Vec<i64>>())
+        .map(|data_line| build_tree(data_line))
+        .map(|tree| expand_tree_width_left(tree))
+        .map(|tree| tree.first().unwrap().first().unwrap().to_owned())
+        .sum())
+}
+
+fn build_tree(line: Vec<i64>) -> Vec<Vec<i64>> {
+    let mut tree = vec![line];
+
+    loop {
+        let last_layer = tree.last().unwrap();
+        if last_layer.iter().filter(|num| num != &&0).count() == 0 {
+            return tree
+        }
+
+        let mut new_layer = vec![];
+
+        for  (index, item) in last_layer.iter().enumerate() {
+            if index + 1 >= last_layer.len() {
+                break
+            }
+
+            new_layer.push( last_layer[index+1] - item)
+        }
+
+        tree.push(new_layer);
+    }
+}
+
+fn expand_tree_width_right(tree: Vec<Vec<i64>>) -> Vec<Vec<i64>> {
+    let mut tree = tree.clone();
+    let tree_lines = tree.len();
+
+    for index in 0..tree_lines {
+        if index == 0 {
+            tree.last_mut().unwrap().push(0);
+            continue
+        }
+
+        let line = tree[tree_lines - 1 - index].clone();
+        let line_before = tree[tree_lines - index].clone();
+
+        tree
+            .get_mut(tree_lines - 1 - index)
+            .unwrap()
+            .push(line.last().unwrap() + line_before.last().unwrap().clone())
+    }
+
+    tree
+}
+
+fn expand_tree_width_left(tree: Vec<Vec<i64>>) -> Vec<Vec<i64>> {
+    let mut tree = tree.clone();
+    let tree_lines = tree.len();
+
+    for index in 0..tree_lines {
+        if index == 0 {
+            tree.last_mut().unwrap().insert(0, 0);
+            continue
+        }
+
+        let line = tree[tree_lines - 1 - index].clone();
+        let line_before = tree[tree_lines - index].clone();
+
+        tree
+            .get_mut(tree_lines - 1 - index)
+            .unwrap()
+            .insert(0, line.first().unwrap() - line_before.first().unwrap().clone() )
+    }
+
+    tree
+}
+
+#[test]
+fn test_solve_01() {
+    let example = r#"0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45"#;
+
+    let result = solve_01(example).unwrap();
+
+    assert_eq!(114, result);
+}
+
+#[test]
+fn test_solve_02() {
+    let example = r#"0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45"#;
+
+    let result = solve_02(example).unwrap();
+
+    assert_eq!(2, result);
+}

src/input/day09/input.txt

@@ -0,0 +1,200 @@
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src/main.rs

@@ -7,6 +7,7 @@ mod day05;
 mod day06;
 mod day07;
 mod day08;
+mod day09;
 
 const CONTENT01: &'static str = include_str!("input/day01/input.txt");
 const CONTENT02: &'static str = include_str!("input/day02/input.txt");
@@ -16,6 +17,7 @@ const CONTENT05: &'static str = include_str!("input/day05/input.txt");
 const CONTENT06: &'static str = include_str!("input/day06/input.txt");
 const CONTENT07: &'static str = include_str!("input/day07/input.txt");
 const CONTENT08: &'static str = include_str!("input/day08/input.txt");
+const CONTENT09: &'static str = include_str!("input/day09/input.txt");
 
 fn main() {
     day01::execute_task01(CONTENT01);
@@ -41,4 +43,7 @@ fn main() {
     println!();
     day08::execute_task01(CONTENT08);
     day08::execute_task02(CONTENT08);
+    println!();
+    day09::execute_task01(CONTENT09);
+    day09::execute_task02(CONTENT09);
 }