2022, day5: part1

1 files changed, 62 insertions, 0 deletions

diff --git a/2022/day5/part1/src/main.rs b/2022/day5/part1/src/main.rs
new file mode 100644
index 0000000..f64fcce
--- /dev/null
+++ b/2022/day5/part1/src/main.rs
@@ -0,0 +1,62 @@
+use itertools::Itertools;
+use regex::Regex;
+use std::collections::LinkedList;
+
+fn main() {
+    let input: &str = include_str!("../../input");
+
+    let width_finder = Regex::new(r"(?m)^\s1.*(\d)\s$").unwrap();
+    let mut width = 0;
+
+    for cap in width_finder.captures_iter(input) {
+        width = str::parse(&cap[1]).unwrap();
+    }
+
+    let mut crate_builder: Vec<LinkedList<char>> = Vec::new();
+
+    for _ in 0..width {
+        crate_builder.push(LinkedList::new());
+    }
+
+    for line in input.lines() {
+        let mut idx = 0;
+        if line.contains("1") {
+            break;
+        }
+
+        for part in &line.chars().chunks(4) {
+            let crt: String = part.collect();
+            if !crt.contains("[") {
+                idx += 1;
+            } else {
+                let crate_ = crt.chars().nth(1).unwrap();
+                crate_builder[idx].push_back(crate_);
+                idx += 1;
+            }
+        }
+    }
+
+    let move_parser = Regex::new(r"^move\s(\d+)\sfrom\s(\d)\sto\s(\d)").unwrap();
+
+    for mv in input.lines().skip_while(|l| !l.contains("move")) {
+        for cap in move_parser.captures_iter(mv) {
+            let how_many = str::parse(&cap[1]).unwrap();
+            let from: usize = str::parse(&cap[2]).unwrap();
+            let to: usize = str::parse(&cap[3]).unwrap();
+
+            for _ in 0..how_many {
+                if let Some(box_) = crate_builder[from - 1].pop_front() {
+                    crate_builder[to - 1].push_front(box_);
+                }
+            }
+        }
+    }
+
+    println!(
+        "{}",
+        crate_builder
+            .iter()
+            .filter_map(|s| s.front())
+            .collect::<String>()
+    );
+}