First task

01/01.rs

@@ -0,0 +1,24 @@
+use std::fs;
+
+fn main() {
+    let contents = fs::read_to_string("input").unwrap();
+    let numbers: Vec<i32> = contents.lines().map(|s| s.parse().unwrap()).collect();
+    // Part 1
+    for i in 0..numbers.len() - 1 {
+        for j in i..numbers.len() {
+            if numbers[i] + numbers[j] == 2020 {
+                println!("{}", numbers[i] * numbers[j]);
+            }
+        }
+    }
+    // Part 2
+    for i in 0..numbers.len() - 2 {
+        for j in i..numbers.len() - 1 {
+            for k in j..numbers.len() {
+                if numbers[i] + numbers[j] + numbers[k] == 2020 {
+                    println!("{}", numbers[i] * numbers[j] * numbers[k]);
+                }
+            }
+        }
+    }
+}