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use std::{collections::HashMap, str::FromStr, string::ParseError};
#[derive(Debug, Clone)]
struct File {
name: String,
size: usize,
}
#[derive(Debug, Clone)]
struct Directory {
name: String,
}
#[derive(Debug, Clone)]
enum FileType {
File(File),
Dir(Directory),
}
impl FromStr for File {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let splitted: Vec<_> = s.split(" ").collect();
let (size, name) = (
splitted[0].parse::<usize>().unwrap(),
splitted[1].to_string(),
);
Ok(File { name, size })
}
}
impl FromStr for Directory {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let splitted: Vec<_> = s.split(" ").collect();
let (_, name) = (splitted[0], splitted[1].to_string());
Ok(Directory { name })
}
}
impl FromStr for FileType {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if is_file(s) {
Ok(FileType::File(File::from_str(s).unwrap()))
} else {
Ok(FileType::Dir(Directory::from_str(s).unwrap()))
}
}
}
enum CommandType {
ChangeDir,
ListDir,
}
struct Command {
command_type: CommandType,
dir: Directory,
}
fn is_command(s: &str) -> bool {
s.contains("$ cd")
}
fn is_file(s: &str) -> bool {
s.split(" ").nth(0).unwrap().parse::<usize>().is_ok()
}
fn is_dir(s: &str) -> bool {
s.contains("dir")
}
fn calculate_size_part_one(
dir: String,
dirs: &HashMap<String, Vec<FileType>>,
list_of_dirs_under_100k: &mut Vec<usize>,
) -> usize {
let mut size: usize = 0;
let files = dirs.get(&dir).unwrap();
for file in files {
match file {
FileType::File(cur_file) => {
size += cur_file.size;
}
FileType::Dir(cur_dir) => {
let dir_sz =
calculate_size_part_one(cur_dir.name.clone(), dirs, list_of_dirs_under_100k);
if dir_sz <= 100000 {
list_of_dirs_under_100k.push(dir_sz)
}
size += dir_sz;
}
}
}
size
}
fn calculate_size_part_two(
dir: String,
dirs: &HashMap<String, Vec<FileType>>,
list_of_dirs: &mut Vec<usize>,
) -> usize {
let mut size: usize = 0;
let files = dirs.get(&dir).unwrap();
for file in files {
match file {
FileType::File(cur_file) => {
size += cur_file.size;
}
FileType::Dir(cur_dir) => {
let dir_sz = calculate_size_part_two(cur_dir.name.clone(), dirs, list_of_dirs);
list_of_dirs.push(dir_sz);
size += dir_sz;
}
}
}
size
}
impl FromStr for Command {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let splitted: Vec<_> = s.split(" ").collect();
let (_, cmd, dir) = (splitted[0], splitted[1], splitted[2]);
Ok(Command {
command_type: match cmd {
"cd" => CommandType::ChangeDir,
"ls" => CommandType::ListDir,
_ => unreachable!(),
},
dir: Directory {
name: dir.to_string(),
},
})
}
}
fn solve_part_one(data: &str) -> usize {
let mut dirs: HashMap<String, Vec<FileType>> = HashMap::new();
let mut cwd: String = "/".to_string();
for line in data.lines() {
if is_command(line) {
let cmd = Command::from_str(line).unwrap();
match cmd.command_type {
CommandType::ChangeDir => {
if cmd.dir.name == ".." && cwd != "/" {
let mut pos_of_last_backslash = cwd.len();
for i in (0..cwd.len() - 2).rev() {
if cwd.get(i..=i).unwrap() == "/" {
pos_of_last_backslash = i + 1;
break;
}
}
cwd = cwd[0..pos_of_last_backslash].to_string()
} else if cmd.dir.name != "/" {
cwd += format!("{}/", cmd.dir.name).as_str();
}
}
CommandType::ListDir => {}
}
}
if is_file(line) {
dirs.entry(cwd.clone())
.or_insert(vec![])
.push(FileType::File(File::from_str(line).unwrap()))
} else if is_dir(line) {
let dir_name = Directory::from_str(line).unwrap().name;
let cur_path = cwd.clone() + format!("{}/", dir_name).as_str();
dirs.entry(cwd.clone())
.or_insert(vec![])
.push(FileType::Dir(Directory { name: cur_path }))
}
}
let mut v: Vec<_> = vec![];
let _ = calculate_size_part_one("/".to_string(), &dirs, &mut v);
v.iter().sum()
}
fn solve_part_two(data: &str) -> usize {
let mut dirs: HashMap<String, Vec<FileType>> = HashMap::new();
let mut cwd: String = "/".to_string();
for line in data.lines() {
if is_command(line) {
let cmd = Command::from_str(line).unwrap();
match cmd.command_type {
CommandType::ChangeDir => {
if cmd.dir.name == ".." && cwd != "/" {
let mut pos_of_last_backslash = cwd.len();
for i in (0..cwd.len() - 2).rev() {
if cwd.get(i..=i).unwrap() == "/" {
pos_of_last_backslash = i + 1;
break;
}
}
cwd = cwd[0..pos_of_last_backslash].to_string()
} else if cmd.dir.name != "/" {
cwd += format!("{}/", cmd.dir.name).as_str();
}
}
CommandType::ListDir => {}
}
}
if is_file(line) {
dirs.entry(cwd.clone())
.or_insert(vec![])
.push(FileType::File(File::from_str(line).unwrap()))
} else if is_dir(line) {
let dir_name = Directory::from_str(line).unwrap().name;
let cur_path = cwd.clone() + format!("{}/", dir_name).as_str();
dirs.entry(cwd.clone())
.or_insert(vec![])
.push(FileType::Dir(Directory { name: cur_path }))
}
}
let mut v: Vec<_> = vec![];
let
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