day 07

aoc_07/.gitignore

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+# ---> Rust
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+

aoc_07/Cargo.toml

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+[package]
+name = "aoc_07"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

aoc_07/src/main.rs

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+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+use std::collections::HashMap;
+
+fn main() {
+    let file_path = String::from("input");
+	let mut selected = Vec::<String>::new();
+	let mut folders = HashMap::<String, u32>::new();
+
+    println!("In file {}", file_path);
+
+    if let Ok(lines) = read_lines(file_path) {
+        // Consumes the iterator, returns an (Optional) String
+        for line in lines {
+            if let Ok(ip) = line {
+                match &ip[..3] {
+                    "dir" => {
+                        let dir = String::from(ip.split(" ").nth(1).unwrap());
+                        folders.insert(String::from(selected.last().unwrap()) + "/" + &dir, 0);
+                    },
+                    "$ c" => {
+                        let dir = String::from(ip.split(" ").nth(2).unwrap());
+                        if dir == ".." {
+                            selected.pop();
+                        }
+                        else {
+                            if selected.len() > 0 {
+                                selected.push(String::from(selected.last().unwrap()) + "/" + &dir);
+                            }
+                            else {
+                                selected.push(String::from(""));
+                            }
+                        }
+                    },
+                    "$ l" => (),
+                    _ => {
+                        for dir in &selected {
+                            let file_size = String::from(ip.split(" ").nth(0).unwrap()).parse::<u32>().unwrap();
+                            *folders.entry(String::from(dir)).or_insert(0) += file_size;
+                        }
+                    },
+                }
+            }
+        }
+    }
+
+    //println!("{}", folders[""]);
+    let minimum = 30000000 - (70000000 - folders[""]);
+    let mut result = 0;
+    let mut result2 = 70000000;
+    for (dir, size) in folders {
+        println!("{} {}", dir, size);
+        if size < 100000 {
+            result += size;
+        }
+        if size < result2 && size > minimum {
+            result2 = size;
+        }
+    }
+    println!("exercise 1: {} exercise 2: {}", result, result2);
+}
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}