day 1 full

src/tasks/day01.rs

@@ -0,0 +1,36 @@
+use std::fs;
+
+pub fn run() {
+    let content = fs::read_to_string("input/day01.txt").unwrap();
+    task1(&content);
+    task2(&content);
+}
+
+fn task1(content: &String) {
+    let fuel: i32 = content
+        .lines()
+        .map(|line| line.parse::<i32>().unwrap())
+        .map(|mass| mass / 3 - 2)
+        .sum();
+
+    println!("Task 1: {}", fuel);
+}
+
+fn task2(content: &String) {
+    fn while_fun(mass: i32) -> i32 {
+        let to_add = mass / 3 - 2;
+        if to_add < 1 {
+            0
+        } else {
+            to_add + while_fun(to_add)
+        }
+    };
+
+    let fuel: i32 = content
+        .lines()
+        .map(|line| line.parse::<i32>().unwrap())
+        .map(while_fun)
+        .sum();
+
+    println!("Task 2: {}", fuel);
+}

src/tasks/mod.rs

@@ -0,0 +1 @@
+pub mod day01;