Day 5. Parsing stuff is... not easy yet. I should probably learn regex

day5/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day5"
+version = "0.1.0"

day5/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day5"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day5/data.txt

@@ -0,0 +1,511 @@
+[V]     [B]                     [C]
+[C]     [N] [G]         [W]     [P]
+[W]     [C] [Q] [S]     [C]     [M]
+[L]     [W] [B] [Z]     [F] [S] [V]
+[R]     [G] [H] [F] [P] [V] [M] [T]
+[M] [L] [R] [D] [L] [N] [P] [D] [W]
+[F] [Q] [S] [C] [G] [G] [Z] [P] [N]
+[Q] [D] [P] [L] [V] [D] [D] [C] [Z]
+ 1   2   3   4   5   6   7   8   9 
+
+move 1 from 9 to 2
+move 4 from 6 to 1
+move 4 from 2 to 6
+move 5 from 8 to 7
+move 4 from 9 to 2
+move 1 from 5 to 8
+move 1 from 3 to 1
+move 2 from 3 to 1
+move 1 from 4 to 2
+move 11 from 7 to 2
+move 5 from 5 to 1
+move 1 from 6 to 8
+move 1 from 7 to 6
+move 3 from 6 to 7
+move 1 from 3 to 2
+move 1 from 6 to 8
+move 11 from 2 to 1
+move 1 from 9 to 8
+move 1 from 3 to 7
+move 4 from 7 to 9
+move 3 from 3 to 7
+move 4 from 8 to 2
+move 3 from 7 to 6
+move 2 from 6 to 3
+move 5 from 4 to 1
+move 1 from 6 to 5
+move 26 from 1 to 7
+move 1 from 4 to 6
+move 22 from 7 to 5
+move 4 from 9 to 1
+move 3 from 7 to 3
+move 1 from 6 to 3
+move 6 from 1 to 7
+move 2 from 7 to 5
+move 8 from 1 to 9
+move 4 from 3 to 4
+move 10 from 2 to 7
+move 6 from 7 to 4
+move 2 from 9 to 5
+move 1 from 5 to 1
+move 8 from 4 to 1
+move 2 from 5 to 9
+move 1 from 3 to 6
+move 1 from 9 to 1
+move 1 from 3 to 6
+move 2 from 5 to 2
+move 1 from 4 to 2
+move 1 from 2 to 3
+move 7 from 1 to 4
+move 9 from 7 to 4
+move 1 from 3 to 4
+move 2 from 2 to 4
+move 5 from 9 to 6
+move 1 from 4 to 5
+move 2 from 9 to 3
+move 1 from 1 to 6
+move 2 from 6 to 1
+move 2 from 6 to 5
+move 2 from 9 to 7
+move 1 from 3 to 9
+move 1 from 9 to 5
+move 2 from 7 to 3
+move 1 from 1 to 7
+move 7 from 4 to 5
+move 2 from 1 to 2
+move 3 from 3 to 8
+move 3 from 8 to 9
+move 31 from 5 to 8
+move 1 from 7 to 1
+move 1 from 2 to 1
+move 1 from 1 to 5
+move 1 from 5 to 6
+move 2 from 5 to 7
+move 10 from 4 to 9
+move 5 from 6 to 2
+move 3 from 2 to 6
+move 2 from 7 to 8
+move 1 from 6 to 3
+move 1 from 4 to 1
+move 1 from 3 to 6
+move 1 from 4 to 2
+move 2 from 1 to 2
+move 1 from 8 to 7
+move 10 from 8 to 2
+move 13 from 2 to 9
+move 1 from 1 to 5
+move 18 from 8 to 2
+move 21 from 9 to 6
+move 1 from 7 to 8
+move 2 from 9 to 7
+move 1 from 2 to 3
+move 1 from 7 to 8
+move 9 from 2 to 4
+move 1 from 7 to 8
+move 3 from 9 to 1
+move 1 from 8 to 1
+move 6 from 2 to 3
+move 5 from 4 to 7
+move 1 from 5 to 8
+move 2 from 4 to 3
+move 5 from 7 to 3
+move 2 from 2 to 7
+move 15 from 6 to 1
+move 12 from 1 to 2
+move 6 from 2 to 9
+move 4 from 9 to 5
+move 4 from 5 to 6
+move 14 from 3 to 9
+move 1 from 6 to 7
+move 1 from 7 to 2
+move 1 from 7 to 8
+move 9 from 2 to 6
+move 1 from 1 to 6
+move 2 from 9 to 8
+move 4 from 9 to 7
+move 1 from 1 to 5
+move 8 from 8 to 3
+move 1 from 5 to 4
+move 2 from 1 to 2
+move 3 from 1 to 4
+move 9 from 6 to 2
+move 1 from 7 to 4
+move 1 from 8 to 2
+move 1 from 6 to 4
+move 4 from 7 to 8
+move 12 from 6 to 8
+move 3 from 2 to 1
+move 6 from 8 to 7
+move 5 from 3 to 6
+move 3 from 3 to 6
+move 3 from 1 to 3
+move 8 from 2 to 9
+move 2 from 4 to 5
+move 2 from 7 to 2
+move 10 from 8 to 5
+move 3 from 3 to 2
+move 10 from 5 to 3
+move 1 from 4 to 3
+move 1 from 2 to 1
+move 1 from 1 to 7
+move 14 from 9 to 6
+move 5 from 2 to 4
+move 15 from 6 to 5
+move 3 from 9 to 3
+move 1 from 8 to 6
+move 1 from 3 to 8
+move 7 from 3 to 8
+move 16 from 5 to 1
+move 2 from 7 to 1
+move 1 from 5 to 9
+move 2 from 9 to 3
+move 15 from 1 to 5
+move 3 from 8 to 2
+move 3 from 3 to 1
+move 3 from 7 to 3
+move 8 from 4 to 6
+move 5 from 1 to 6
+move 9 from 5 to 7
+move 2 from 8 to 3
+move 2 from 2 to 7
+move 1 from 1 to 4
+move 2 from 5 to 8
+move 4 from 3 to 1
+move 4 from 8 to 1
+move 1 from 8 to 6
+move 9 from 7 to 6
+move 2 from 7 to 5
+move 3 from 1 to 8
+move 1 from 4 to 8
+move 1 from 2 to 4
+move 12 from 6 to 2
+move 3 from 8 to 6
+move 1 from 4 to 7
+move 2 from 6 to 8
+move 5 from 5 to 9
+move 13 from 2 to 9
+move 2 from 4 to 7
+move 13 from 9 to 5
+move 2 from 6 to 5
+move 1 from 3 to 9
+move 6 from 9 to 4
+move 5 from 1 to 3
+move 1 from 7 to 9
+move 15 from 5 to 8
+move 2 from 4 to 7
+move 2 from 4 to 6
+move 1 from 4 to 6
+move 1 from 5 to 7
+move 18 from 6 to 2
+move 2 from 7 to 3
+move 3 from 6 to 7
+move 3 from 2 to 8
+move 5 from 7 to 3
+move 1 from 9 to 6
+move 2 from 3 to 8
+move 11 from 3 to 2
+move 2 from 2 to 9
+move 1 from 6 to 2
+move 1 from 7 to 5
+move 1 from 5 to 9
+move 9 from 8 to 4
+move 1 from 4 to 6
+move 2 from 3 to 1
+move 2 from 1 to 5
+move 12 from 8 to 3
+move 1 from 8 to 2
+move 14 from 3 to 4
+move 1 from 6 to 4
+move 1 from 5 to 4
+move 20 from 2 to 7
+move 2 from 9 to 5
+move 1 from 5 to 3
+move 1 from 9 to 2
+move 1 from 2 to 8
+move 2 from 2 to 3
+move 5 from 4 to 5
+move 6 from 5 to 7
+move 2 from 8 to 2
+move 3 from 3 to 9
+move 5 from 4 to 5
+move 2 from 9 to 7
+move 2 from 2 to 3
+move 1 from 9 to 3
+move 22 from 7 to 3
+move 4 from 7 to 4
+move 24 from 3 to 6
+move 4 from 2 to 6
+move 18 from 6 to 9
+move 15 from 4 to 6
+move 8 from 6 to 3
+move 6 from 6 to 1
+move 7 from 9 to 6
+move 2 from 7 to 4
+move 8 from 3 to 9
+move 14 from 6 to 3
+move 2 from 3 to 9
+move 1 from 9 to 6
+move 13 from 9 to 1
+move 3 from 4 to 5
+move 1 from 9 to 6
+move 5 from 1 to 8
+move 3 from 3 to 9
+move 2 from 1 to 5
+move 8 from 5 to 8
+move 10 from 3 to 5
+move 3 from 4 to 6
+move 6 from 1 to 9
+move 4 from 5 to 3
+move 5 from 8 to 2
+move 6 from 6 to 3
+move 7 from 3 to 6
+move 1 from 3 to 4
+move 5 from 8 to 7
+move 5 from 2 to 6
+move 2 from 7 to 3
+move 3 from 7 to 3
+move 1 from 4 to 9
+move 9 from 6 to 9
+move 2 from 6 to 2
+move 1 from 8 to 2
+move 2 from 8 to 7
+move 5 from 1 to 5
+move 1 from 1 to 4
+move 13 from 5 to 7
+move 5 from 3 to 7
+move 1 from 5 to 6
+move 1 from 4 to 6
+move 3 from 2 to 8
+move 1 from 3 to 5
+move 1 from 3 to 8
+move 14 from 7 to 4
+move 1 from 5 to 6
+move 7 from 6 to 9
+move 6 from 7 to 9
+move 2 from 8 to 9
+move 2 from 8 to 1
+move 31 from 9 to 1
+move 13 from 4 to 2
+move 1 from 4 to 3
+move 10 from 2 to 7
+move 1 from 3 to 4
+move 1 from 2 to 7
+move 3 from 7 to 8
+move 1 from 4 to 1
+move 3 from 8 to 5
+move 32 from 1 to 5
+move 3 from 9 to 7
+move 4 from 9 to 6
+move 2 from 2 to 7
+move 2 from 1 to 7
+move 1 from 6 to 1
+move 1 from 9 to 4
+move 3 from 6 to 4
+move 1 from 1 to 8
+move 15 from 5 to 1
+move 1 from 8 to 4
+move 9 from 5 to 7
+move 1 from 9 to 8
+move 1 from 8 to 1
+move 10 from 1 to 9
+move 1 from 4 to 2
+move 2 from 9 to 5
+move 4 from 9 to 6
+move 1 from 2 to 7
+move 3 from 4 to 2
+move 1 from 1 to 5
+move 5 from 1 to 5
+move 1 from 4 to 9
+move 3 from 6 to 7
+move 23 from 7 to 6
+move 1 from 2 to 4
+move 1 from 2 to 5
+move 9 from 5 to 4
+move 1 from 2 to 5
+move 9 from 5 to 6
+move 1 from 9 to 7
+move 1 from 9 to 3
+move 3 from 9 to 4
+move 14 from 6 to 3
+move 5 from 7 to 4
+move 1 from 7 to 5
+move 1 from 5 to 9
+move 2 from 5 to 6
+move 16 from 6 to 2
+move 2 from 6 to 1
+move 7 from 4 to 8
+move 2 from 1 to 2
+move 4 from 3 to 5
+move 5 from 4 to 7
+move 2 from 6 to 7
+move 4 from 4 to 1
+move 4 from 8 to 9
+move 1 from 4 to 5
+move 1 from 6 to 8
+move 1 from 4 to 9
+move 4 from 1 to 7
+move 1 from 9 to 4
+move 2 from 2 to 7
+move 7 from 3 to 9
+move 15 from 2 to 3
+move 4 from 8 to 6
+move 1 from 4 to 7
+move 2 from 9 to 7
+move 1 from 6 to 8
+move 2 from 7 to 2
+move 5 from 7 to 2
+move 1 from 5 to 2
+move 6 from 2 to 9
+move 3 from 7 to 1
+move 3 from 1 to 2
+move 3 from 7 to 1
+move 2 from 2 to 9
+move 2 from 6 to 9
+move 1 from 8 to 3
+move 19 from 3 to 9
+move 1 from 6 to 3
+move 3 from 7 to 4
+move 1 from 2 to 5
+move 2 from 1 to 9
+move 2 from 2 to 3
+move 33 from 9 to 7
+move 1 from 1 to 7
+move 3 from 3 to 7
+move 1 from 3 to 2
+move 1 from 5 to 8
+move 4 from 9 to 7
+move 1 from 5 to 2
+move 2 from 4 to 9
+move 4 from 9 to 7
+move 3 from 2 to 1
+move 1 from 4 to 3
+move 1 from 9 to 7
+move 1 from 8 to 3
+move 7 from 7 to 3
+move 3 from 1 to 9
+move 4 from 9 to 7
+move 4 from 5 to 8
+move 3 from 3 to 4
+move 3 from 4 to 5
+move 3 from 3 to 6
+move 2 from 6 to 5
+move 38 from 7 to 5
+move 40 from 5 to 3
+move 4 from 8 to 9
+move 1 from 6 to 9
+move 1 from 5 to 1
+move 3 from 7 to 6
+move 1 from 7 to 5
+move 38 from 3 to 8
+move 1 from 1 to 9
+move 3 from 9 to 6
+move 5 from 3 to 9
+move 4 from 8 to 6
+move 1 from 7 to 1
+move 3 from 5 to 9
+move 1 from 1 to 2
+move 10 from 8 to 3
+move 5 from 8 to 1
+move 3 from 1 to 2
+move 9 from 6 to 7
+move 9 from 3 to 5
+move 1 from 7 to 6
+move 1 from 3 to 8
+move 1 from 7 to 9
+move 1 from 1 to 5
+move 1 from 1 to 3
+move 1 from 9 to 2
+move 4 from 2 to 3
+move 1 from 2 to 4
+move 9 from 8 to 1
+move 2 from 9 to 5
+move 2 from 1 to 2
+move 2 from 3 to 4
+move 6 from 8 to 6
+move 10 from 5 to 3
+move 7 from 3 to 2
+move 2 from 1 to 2
+move 5 from 1 to 7
+move 7 from 9 to 6
+move 7 from 6 to 5
+move 1 from 4 to 3
+move 7 from 7 to 4
+move 5 from 3 to 9
+move 7 from 2 to 6
+move 4 from 7 to 8
+move 5 from 8 to 9
+move 1 from 2 to 6
+move 1 from 3 to 5
+move 2 from 2 to 8
+move 8 from 4 to 6
+move 7 from 9 to 7
+move 4 from 7 to 9
+move 7 from 9 to 3
+move 8 from 3 to 1
+move 6 from 5 to 9
+move 8 from 1 to 8
+move 13 from 8 to 4
+move 3 from 9 to 6
+move 1 from 8 to 6
+move 1 from 7 to 3
+move 2 from 4 to 1
+move 5 from 9 to 1
+move 1 from 3 to 7
+move 15 from 6 to 1
+move 1 from 7 to 9
+move 10 from 4 to 7
+move 11 from 7 to 5
+move 17 from 1 to 6
+move 1 from 9 to 3
+move 6 from 6 to 1
+move 3 from 5 to 3
+move 2 from 4 to 5
+move 2 from 7 to 8
+move 12 from 5 to 3
+move 13 from 6 to 9
+move 2 from 8 to 2
+move 2 from 5 to 1
+move 16 from 3 to 8
+move 3 from 2 to 3
+move 2 from 3 to 7
+move 2 from 7 to 9
+move 1 from 3 to 7
+move 4 from 8 to 4
+move 2 from 4 to 8
+move 5 from 1 to 5
+move 2 from 4 to 7
+move 6 from 6 to 8
+move 2 from 8 to 5
+move 2 from 1 to 4
+move 5 from 8 to 7
+move 5 from 6 to 3
+move 6 from 9 to 8
+move 2 from 9 to 2
+move 1 from 1 to 7
+move 4 from 5 to 3
+move 2 from 2 to 3
+move 1 from 4 to 9
+move 10 from 3 to 6
+move 1 from 3 to 7
+move 10 from 7 to 2
+move 2 from 5 to 3
+move 1 from 4 to 2
+move 2 from 6 to 8
+move 3 from 6 to 5
+move 1 from 6 to 1
+move 7 from 2 to 3
+move 6 from 8 to 7
+move 4 from 6 to 3
+move 14 from 8 to 6
+move 11 from 6 to 8
+move 1 from 1 to 4
+move 6 from 7 to 2
+move 3 from 5 to 8
+move 4 from 1 to 7
+move 1 from 2 to 8
+move 1 from 2 to 6
+move 1 from 3 to 4
+move 1 from 5 to 6
+move 7 from 8 to 6
+move 9 from 3 to 2
+move 1 from 8 to 5

day5/src/main.rs

@@ -0,0 +1,74 @@
+#[derive(Debug)]
+struct Move {
+    num: usize,
+    from: usize,
+    to: usize,
+}
+
+fn main() {
+    let contents = std::fs::read_to_string("data.txt").expect("Failed to read file");
+    let (crates, moves) = contents.split_once("\n\n").unwrap(); // break into 2 parts
+    let moves: Vec<Move> = moves.trim().split('\n').map(line_to_move).collect();
+    let crate_lines: Vec<&str> = crates.split('\n').collect();
+    let crate_lines = &crate_lines[0..crate_lines.len() - 1]; // remove the stack numbers line
+    let crate_lines: Vec<Vec<char>> = crate_lines.iter().map(|x| clean_crates(&x)).collect();
+
+    // Part 1
+    let mut stacks_part1 = lines_to_crates(&crate_lines);
+    rearrange(&mut stacks_part1, &moves, false);
+    let tops: String = stacks_part1.iter().map(|x| x.last().unwrap()).collect();
+    println!("Tops part 1: {:?}", tops);
+
+    // Part 2
+    let mut stacks_part2 = lines_to_crates(&crate_lines);
+    rearrange(&mut stacks_part2, &moves, true);
+    let tops: String = stacks_part2.iter().map(|x| x.last().unwrap()).collect();
+    println!("Tops part 2: {:?}", tops);
+}
+
+fn line_to_move(line: &str) -> Move {
+    let parts: Vec<&str> = line.split(' ').collect();
+
+    Move {
+        num: parts[1].parse().unwrap(),
+        from: parts[3].parse().unwrap(),
+        to: parts[5].parse().unwrap(),
+    }
+}
+
+// strip spaces and brackets from the crates lines
+fn clean_crates(line: &str) -> Vec<char> {
+    let chars = line.chars().collect::<Vec<char>>();
+    let chunks = chars.chunks(4).collect::<Vec<&[char]>>();
+    chunks.iter().map(|x| x[1]).collect()
+}
+
+fn lines_to_crates(lines: &Vec<Vec<char>>) -> Vec<Vec<char>> {
+    let mut crates: Vec<Vec<char>> = Vec::new();
+
+    for col in 0..lines[0].len() {
+        let mut stack = Vec::new();
+        for row in (0..lines.len()).rev() {
+            let val = lines[row][col];
+            if val != ' ' {
+                stack.push(val);
+            }
+        }
+        crates.push(stack);
+    }
+    crates
+}
+
+fn rearrange(crates: &mut Vec<Vec<char>>, moves: &Vec<Move>, reverse: bool) -> () {
+    for m in moves {
+        let mut temp: Vec<char> = Vec::new();
+        for _ in 0..m.num {
+            let val = crates[m.from - 1].pop().unwrap();
+            temp.push(val);
+        }
+        if reverse {
+            temp.reverse();
+        }
+        crates[m.to - 1].append(&mut temp);
+    }
+}

day5/test.txt

@@ -0,0 +1,9 @@
+    [D]    
+[N] [C]    
+[Z] [M] [P]
+ 1   2   3 
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2