Day 7 I don't know what I did

day7/src/main.rs

@@ -1,5 +1,6 @@
-use std::{fs::read_to_string, iter::Peekable, str::Lines};
+use std::{collections::HashMap, fs::read_to_string, iter::Peekable, str::Lines};
 
+/*
 #[derive(PartialEq, Debug)]
 struct File {
     name: String,
@@ -115,3 +116,68 @@ fn main() {
     let sol2 = sizes.filter(|s| s >= &additional).min().unwrap();
     println!("Deleting Directory with size {sol2}");
 }
+*/
+
+fn main() {
+    let input = read_to_string("input.txt").unwrap();
+    let mut cwd = "/".to_owned();
+    let mut files = HashMap::new();
+    for line in input.lines() {
+        let line = line.split_whitespace().collect::<Vec<_>>();
+        match line.len() {
+            3 => match line[2] {
+                "/" => cwd = "/".to_owned(),
+                ".." => {
+                    cwd = {
+                        if cwd == "/" {
+                            cwd
+                        } else {
+                            let dirs = cwd.split_inclusive('/').collect::<Vec<_>>();
+                            let nwd = dirs[..(dirs.len() - 1)]
+                                .iter()
+                                .fold(String::new(), |s, v| s + v);
+                            nwd
+                        }
+                    }
+                }
+                dir => cwd = cwd + dir + "/",
+            },
+            2 => {
+                if (line[0] != "$") && (line[0] != "dir") {
+                    let size = line[0].parse::<usize>().unwrap();
+                    let path = cwd.clone() + line[1];
+                    files.insert(path, size);
+                }
+            }
+            _ => (),
+        }
+    }
+    let mut directories = HashMap::new();
+    for (path, size) in files {
+        let mut folders = path
+            .split_terminator('/')
+            .map(|s| s.to_owned())
+            .collect::<Vec<String>>();
+        folders.pop();
+        for (index, folder) in folders.clone().iter().enumerate() {
+            let previus = if index > 0 { &folders[index - 1] } else { "" };
+            folders[index] = previus.to_owned() + folder + "/";
+        }
+        for folder in folders {
+            *directories.entry(folder).or_insert(0) += size;
+        }
+    }
+    let result1: usize = directories.values().filter(|&&size| size < 100_000).sum();
+    const TOTAL_SPACE: usize = 70000000;
+    const NEEDED_FREE: usize = 30000000;
+    let used = *directories.entry("/".to_owned()).or_insert(0);
+    let free = TOTAL_SPACE - used;
+    let additional = NEEDED_FREE - free;
+    let result2: usize = directories
+        .values()
+        .filter(|&&size| size >= additional)
+        .min()
+        .map(|size| *size)
+        .unwrap_or(0);
+    println!("{result1} bytes used by directories smaller than 100000. {result2} Bytes removed by the smallest directory");
+}