day 1 full

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aoc_2019"
+version = "0.1.0"
+

Cargo.toml

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+[package]
+name = "aoc_2019"
+version = "0.1.0"
+authors = ["Johannes <jschaef@mail.uni-paderborn.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

input/day01.txt

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+70102
+60688
+105331
+127196
+141253
+118164
+67481
+75634
+60715
+84116
+51389
+52440
+84992
+87519
+85765
+124479
+97873
+85437
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+70561
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+128042
+67596
+136905
+111849
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+135608
+91006
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+52100
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+127796
+114893
+82414
+66565
+73704
+110396
+142722
+107813
+149628
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+118421
+56566
+84962
+108120
+108438
+81536
+55238
+77072
+132575
+82716
+50641
+57320
+89661
+97094
+134713
+142451
+128541
+53527
+116088
+101909
+124349
+103812
+108324
+72981
+114488
+78738
+78523
+129146
+103007
+68506
+102227
+93507
+94557
+105867
+125514
+109130
+146102
+100876
+143549
+85753
+97589
+90892
+104287
+70930
+53847
+94687
+135370
+76024
+76156
+101006
+128349
+58134
+110849
+149176
+136728
+79054
+136740
+131081

src/main.rs

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+mod tasks;
+
+fn main() {
+    tasks::day01::run();
+}

src/tasks/day01.rs

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+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

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+pub mod day01;