diff --git a/day5/Cargo.lock b/day5/Cargo.lock new file mode 100644 index 0000000..7a62bb0 --- /dev/null +++ b/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" diff --git a/day5/Cargo.toml b/day5/Cargo.toml new file mode 100644 index 0000000..f9b62bf --- /dev/null +++ b/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] diff --git a/day5/input b/day5/input new file mode 100644 index 0000000..cc0498e --- /dev/null +++ b/day5/input @@ -0,0 +1,512 @@ + [Q] [B] [H] + [F] [W] [D] [Q] [S] + [D] [C] [N] [S] [G] [F] + [R] [D] [L] [C] [N] [Q] [R] +[V] [W] [L] [M] [P] [S] [M] [M] +[J] [B] [F] [P] [B] [B] [P] [F] [F] +[B] [V] [G] [J] [N] [D] [B] [L] [V] +[D] [P] [R] [W] [H] [R] [Z] [W] [S] + 1 2 3 4 5 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to 6 +move 7 from 8 to 5 +move 1 from 8 to 4 +move 2 from 5 to 7 +move 1 from 2 to 4 +move 5 from 6 to 1 +move 4 from 3 to 2 diff --git a/day5/src/main.rs b/day5/src/main.rs new file mode 100644 index 0000000..7b20c8b --- /dev/null +++ b/day5/src/main.rs @@ -0,0 +1,117 @@ +use std::fs::File; +use std::io::{prelude::*, BufReader}; + +#[derive(Clone, Debug)] +struct Crate { + label: String, +} + +#[derive(Clone, Debug)] +struct GameBoard { + labels: Vec, + board: Vec>, +} + +impl GameBoard { + fn game1_move(&mut self, count: usize, from: usize, to: usize) { + let ref mut v: Vec = Vec::new(); + let work = self.board.get_mut(from - 1).unwrap(); + for _ in 0..count { + v.push(work.pop().unwrap()); + } + let work = self.board.get_mut(to - 1).unwrap(); + for _ in 0..count { + work.append(v); + } + } + fn game2_move(&mut self, count: usize, from: usize, to: usize) { + let ref mut v: Vec = Vec::new(); + let work = self.board.get_mut(from - 1).unwrap(); + for _ in 0..count { + v.push(work.pop().unwrap()); + } + v.reverse(); + let work = self.board.get_mut(to - 1).unwrap(); + for _ in 0..count { + work.append(v); + } + } + fn get_tops(&self) -> String { + self.board + .iter() + .map(|x| x.last().unwrap().label.clone()) + .fold("".to_string(), |acc, x| acc + &x) + } +} +impl From> for GameBoard { + fn from(v: Vec) -> Self { + let mut board_vec = v.clone(); + let label_vec = board_vec.pop().unwrap(); + // get labels + let labels = label_vec + .split_whitespace() + .map(|x| x.to_string()) + .collect::>(); + //TODO sscanf for crates + board_vec.reverse(); + let mut board = vec![Vec::new(); labels.len()]; + board_vec.iter().for_each(|line| { + board.iter_mut().enumerate().for_each(|(i, col)| { + let (begin, end) = (i * 4, std::cmp::min(i * 4 + 4, line.len())); + let crate_str = line[begin..end] + .to_string() + .matches(char::is_alphabetic) + .collect::(); + if !crate_str.is_empty() { + col.push(Crate { label: crate_str }); + } + }) + }); + GameBoard { labels, board } + } +} + +fn main() -> std::io::Result<()> { + //Read in file + let file = File::open("input")?; + let reader = BufReader::new(file); + + //read in the parts of the file + let (board_lines, movement_lines, _) = reader.lines().fold( + (Vec::new(), Vec::new(), false), + |mut acc: (Vec, Vec, bool), line| { + let line = line.unwrap(); + if line.is_empty() { + acc.2 = true; + } else if acc.2 { + acc.1.push(line); + } else { + acc.0.push(line); + } + acc + }, + ); + println!("{:?}", board_lines); + let mut board = GameBoard::from(board_lines); + + movement_lines.iter().for_each(|line| { + match line + .split_whitespace() + .filter_map(|x| x.parse::().ok()) + .collect::>()[..] + { + [count, from, to] => board.game2_move(count, from, to), + _ => panic!( + "{:#?} {:?}", + board, + line.matches(char::is_numeric) + .map(|x| x.parse::().unwrap()) + .collect::>() + ), + }; + }); + + println!("{}", board.get_tops()); + + Ok(()) +}