day01 both

src/tasks/day01.rs

@@ -0,0 +1,36 @@
+use std::collections::HashSet;
+use utils;
+
+pub fn task1() {
+    let contents = utils::read_file("input/day01.txt");
+
+    let mut frequency = 0;
+    for line in contents.split_whitespace() {
+        let number: i32 = line.parse().unwrap();
+        frequency += number;
+    }
+
+    println!("Result: {}", frequency);
+}
+
+pub fn task2() {
+    let contents = utils::read_file("input/day01.txt");
+
+    let mut seen = HashSet::new();
+
+    let mut frequency = 0;
+    seen.insert(frequency);
+    let changes: Vec<i32> = contents.lines().map(|line| line.parse().unwrap()).collect();
+
+    loop {
+        for number in changes.iter() {
+            frequency += number;
+            if seen.contains(&frequency) {
+                println!("{} was there already!", frequency);
+                return;
+            }
+
+            seen.insert(frequency);
+        }
+    }
+}