day11 part 1

src/main.rs

@@ -1,4 +1,4 @@
 fn main() {
-    aoc_2018::tasks::day10::task1();
+    aoc_2018::tasks::day11::task1();
     // aoc_2018::tasks::day09::task2();
 }

src/tasks/day11.rs

@@ -0,0 +1,38 @@
+pub fn task1() {
+    let serial = 6392;
+    let result = (1..=297)
+        .flat_map(|x: i32| (1..=297).map(move |y: i32| (x, y)))
+        .map(|(x, y)| {
+            let power: i32 = (x..x + 3)
+                .map(|x| {
+                    (y..y + 3)
+                        .map(move |y| fuel_level(x, y, serial))
+                        .sum::<i32>()
+                })
+                .sum();
+            (x, y, power)
+        })
+        .max_by_key(|(_, _, value)| *value);
+    println!("{:?}", result);
+}
+
+fn fuel_level(x: i32, y: i32, serial: i32) -> i32 {
+    let rack_id = x + 10;
+    let mut power = rack_id * y;
+    power += serial;
+    power *= rack_id;
+    power = power / 100 % 10;
+    power = power - 5;
+    power
+}
+
+mod test {
+    use super::fuel_level;
+    #[test]
+    fn name() {
+        assert_eq!(fuel_level(3, 5, 8), 4);
+        assert_eq!(fuel_level(122, 79, 57), -5);
+        assert_eq!(fuel_level(217, 196, 39), 0);
+        assert_eq!(fuel_level(101, 153, 71), 4);
+    }
+}

src/tasks/mod.rs

@@ -8,3 +8,4 @@ pub mod day07;
 pub mod day08;
 pub mod day09;
 pub mod day10;
+pub mod day11;