2022 rust day 7 part 1
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1015
2022/rust/inputs/day07.txt
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1015
2022/rust/inputs/day07.txt
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@ -1,7 +1,9 @@
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extern crate core;
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mod utils;
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mod solutions;
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fn main() {
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solutions::day06::run();
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solutions::day07::run();
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}
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@ -1,3 +1,4 @@
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#![allow(dead_code)]
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use std::collections::HashSet;
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use crate::utils;
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@ -1,26 +1,127 @@
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use std::collections::{HashMap, HashSet};
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use std::ops::{Deref, DerefMut};
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use crate::utils;
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pub fn run() -> () {
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let data = parse_data(utils::read_lines(utils::Source::Scratch));
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let data = parse_data(utils::read_lines(utils::Source::Day(7)));
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println!("Day 5");
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println!("Day 7");
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println!("Part 1: {}", solve1(&data));
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println!("Part 2: {}", solve2(&data));
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}
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fn solve1(data: &()) -> i32 {
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1
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enum CliEntry {
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Cd(String),
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Ls,
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Dir(String),
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File(String, i32),
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}
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fn solve2(data: &()) -> i32 {
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struct FileNode<'data> {
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name: &'data str,
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size: i32,
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}
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struct Node<'data> {
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name: &'data str,
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parent: Option<*mut Node<'data>>,
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files: Vec<FileNode<'data>>,
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subdirs: Vec<Box<Node<'data>>>,
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}
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fn cli_to_tree(data: &[CliEntry]) -> Box<Node> {
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let mut root = Box::new(Node {
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name: "/",
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parent: None,
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files: vec![],
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subdirs: vec![],
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});
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let mut current: &mut Node = root.as_mut();
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for command in data {
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match command {
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CliEntry::Cd(name) => {
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if name == ".." {
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// We don't care, input has to be valid
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unsafe {
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current = &mut *current.parent.unwrap()
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};
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}
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else {
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current = current.subdirs.iter_mut()
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.find(|next| next.name == name)
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.unwrap()
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.deref_mut();
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}
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},
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CliEntry::Ls => {},
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CliEntry::Dir(name) => {
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let current_ptr = current as *mut Node;
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current.subdirs.push(Box::new(Node {
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name,
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parent: Some(current_ptr),
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files: vec![],
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subdirs: vec![]
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}));
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},
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CliEntry::File(name, size) => {
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current.files.push(FileNode { name, size: *size })
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},
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}
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};
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root
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}
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fn find_sizes(root: &Box<Node>) -> (i32, Vec<i32>) {
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let mut acc: i32 = root.files.iter().map(|f| f.size).sum();
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let mut sizes: Vec<i32> = vec![];
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root.subdirs.iter().for_each(|subdir| {
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let (sub_size, sub_sizes) = find_sizes(subdir);
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sizes.extend_from_slice(&sub_sizes);
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acc += sub_size;
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});
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sizes.push(acc);
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(acc, sizes)
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}
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fn solve1(data: &[CliEntry]) -> i32 {
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let tree = cli_to_tree(&data[1..]);
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let (_, sizes) = find_sizes(&tree);
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sizes.into_iter()
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.filter_map(|size| size
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.le(&100000)
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.then_some(size)
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)
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.sum()
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}
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fn solve2(data: &[CliEntry]) -> i32 {
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2
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}
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fn parse_data(data: Vec<String>) -> () {
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()
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fn parse_data(data: Vec<String>) -> Vec<CliEntry> {
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data.into_iter()
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.map(|s| {
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let mut parts = s.split_whitespace().into_iter();
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if s.starts_with('$') {
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match parts.nth(1).unwrap() {
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"cd" => { CliEntry::Cd(parts.next().unwrap().into()) },
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"ls" => { CliEntry::Ls },
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_ => panic!(),
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}
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}
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else {
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match parts.next().unwrap() {
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"dir" => CliEntry::Dir(parts.next().unwrap().into()),
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other => CliEntry::File(parts.next().unwrap().into(), other.parse().unwrap())
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}
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}
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})
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.collect()
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}
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@ -29,14 +130,25 @@ mod tests {
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use super::*;
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fn data() -> Vec<String> {
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vec![""]
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vec![
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"$ cd /",
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"$ ls", "dir a", "14848514 b.txt", "8504156 c.dat", "dir d",
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"$ cd a",
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"$ ls", "dir e", "29116 f", "2557 g", "62596 h.lst",
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"$ cd e",
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"$ ls", "584 i",
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"$ cd ..",
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"$ cd ..",
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"$ cd d",
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"$ ls", "4060174 j", "8033020 d.log", "5626152 d.ext", "7214296 k",
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]
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.into_iter().map(String::from).collect()
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}
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#[test]
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fn part1() {
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let data = parse_data(data());
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assert_eq!(1, solve1(&data));
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assert_eq!(95437, solve1(&data));
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}
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#[test]
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