day02 both

input/day02.txt

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src/main.rs

@@ -1,4 +1,4 @@
 fn main() {
-    aoc_2018::tasks::day01::task1();
+    aoc_2018::tasks::day02::task1();
-    aoc_2018::tasks::day01::task2();
+    aoc_2018::tasks::day02::task2();
 }

src/tasks/day02.rs

@@ -0,0 +1,50 @@
+use utils;
+
+pub fn task1() {
+    let input = utils::read_file("input/day02.txt");
+    let mut count_two = 0;
+    let mut count_three = 0;
+
+    for line in input.lines() {
+        let mut counts = [0u8; 26];
+        for c in line.chars() {
+            counts[(c as usize - 'a' as usize)] += 1;
+        }
+        if counts.iter().any(|count| *count == 2) {
+            count_two += 1;
+        }
+        if counts.iter().any(|count| *count == 3) {
+            count_three += 1;
+        }
+    }
+
+    println!("Part 1: {}", count_two * count_three);
+}
+
+pub fn task2() {
+    let input = utils::read_file("input/day02.txt");
+
+    for x in input.lines() {
+        for y in input.lines() {
+            let mut diff_index = 0;
+            let mut diff_count = 0;
+
+            for (i, (a, b)) in x.chars().zip(y.chars()).enumerate() {
+                if a != b {
+                    diff_index = i;
+                    diff_count += 1;
+                }
+            }
+            if diff_count == 1 {
+                println!(
+                    "Part 2: {}{}",
+                    &x[0..diff_index],
+                    &x[diff_index + 1..x.len()]
+                );
+                return;
+            }
+        }
+    }
+
+    println!("Part 2: None found!");
+}

src/tasks/mod.rs

@@ -1 +1,2 @@
 pub mod day01;
+pub mod day02;