Part 1

2022/rust/src/day5.rs

@@ -1,25 +1,95 @@
 mod common;
 
-type Input = String;
-type Result = usize;
-
-fn processed_input(input: &str) -> Input {
-    input.to_owned()
+#[derive(Debug)]
+struct Move {
+    amount: i32,
+    from: usize,
+    to: usize,
 }
 
-fn part1(input: &Input) -> Result {
-    100
+#[derive(Debug)]
+struct Crates {
+    stacks: Vec<Vec<char>>,
+    moves: Vec<Move>,
+}
+
+const NUM_STACKS: usize = 9;
+
+type Input = Crates;
+type Result = String;
+
+fn processed_input(input: &str) -> Input {
+    let mut stacks: Vec<Vec<char>> = vec![];
+    let mut moves: Vec<Move> = vec![];
+
+    for _ in 0..NUM_STACKS {
+        stacks.push(vec![]);
+    }
+
+    let mut parsing_stacks = true;
+    for l in input.lines() {
+        if l.trim() == "" || l.chars().skip(1).next().unwrap() == '1' {
+            parsing_stacks = false;
+            continue;
+        } else if parsing_stacks {
+            let mut x = 0;
+            for c in l.chars().skip(1).step_by(4) {
+                x += 1;
+                if c == ' ' {
+                    continue;
+                }
+                stacks[x - 1].push(c);
+            }
+        } else {
+            let words: Vec<&str> = l.split_whitespace().collect();
+            println!("words: {:?}", words);
+            moves.push(Move {
+                amount: words[1].parse().unwrap(),
+                from: words[3].parse::<usize>().unwrap() - 1,
+                to: words[5].parse::<usize>().unwrap() - 1,
+            })
+        }
+    }
+
+    for s in &mut stacks[..] {
+        s.reverse();
+    }
+
+    Crates { stacks, moves }
+}
+
+fn perform_moves(crates: &mut Crates) {
+    let stacks = &mut crates.stacks;
+    for Move { amount, from, to } in &crates.moves {
+        println!("move: {} {} {}", amount, from, to);
+        for _ in 0..*amount {
+            let popped = stacks[*from].pop().unwrap();
+            stacks[*to].push(popped);
+        }
+        println!("{:?}", stacks);
+    }
+}
+
+fn part1(input: &mut Input) -> Result {
+    println!("{:?}", input);
+    perform_moves(input);
+
+    let mut r = String::from("");
+    for s in &input.stacks {
+        r.push(s.last().unwrap_or(&' ').clone())
+    }
+    r.trim().to_string()
 }
 
 fn part2(input: &Input) -> Result {
-    0
+    "".to_string()
 }
 
 fn main() {
     let input_text = common::day_input(5);
     eprintln!("{}\n\nAbove is your input file.\n\n", input_text);
-    let input = processed_input(&input_text);
-    common::show_answers(&part1(&input), &part2(&input))
+    let mut input = processed_input(&input_text);
+    common::show_answers(&part1(&mut input), &part2(&input))
     // common::show_both_answers(&both_parts(&input))
 }
 
@@ -31,13 +101,22 @@ fn main() {
 mod tests {
     use super::*;
 
-    const TEST_INPUT: &str = "";
+    const TEST_INPUT: &str = "    [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";
 
     #[test]
     fn test() {
-        let input = processed_input(TEST_INPUT);
-        assert_eq!(part1(&input), 0);
-        assert_eq!(part2(&input), 0);
+        let mut input = processed_input(TEST_INPUT);
+        assert_eq!(part1(&mut input), "CMZ");
+        let mut input = processed_input(TEST_INPUT);
+        assert_eq!(part2(&input), "");
         // assert_eq!(both_parts(&input), (0, 0));
     }
 }