Day 1

Signed-off-by: Anthony Oteri <anthony.oteri@gmail.com>

day-01/src/main.rs

@@ -1,3 +1,104 @@
-fn main() {
-    println!("Hello, world!");
+fn part_1(input: &str) -> u32 {
+    let values: Vec<u32> = input
+        .lines()
+        .into_iter()
+        .map(|line| {
+            let numbers: Vec<u8> = line
+                .chars()
+                .into_iter()
+                .filter(|c| c.is_digit(10))
+                .map(|c| c.to_digit(10).unwrap() as u8)
+                .collect();
+
+            let sum: u32 = numbers[0] as u32 * 10 + *numbers.last().unwrap() as u32;
+            sum
+        })
+        .collect();
+    values.iter().sum()
+}
+
+fn part_2(input: &str) -> u32 {
+    let values: Vec<u32> = input
+        .lines()
+        .into_iter()
+        .map(|line| {
+            let before = line.clone();
+
+            let line = line
+                .to_owned()
+                .replace("twoneighthree", "2183")
+                .replace("twoneightwo", "2182")
+                .replace("oneighthree", "182")
+                .replace("oneightwo", "182")
+                .replace("twoneight", "218")
+                .replace("oneight", "18")
+                .replace("twone", "21")
+                .replace("threeightwo", "382")
+                .replace("threeighthree", "383")
+                .replace("threeight", "38")
+                .replace("fiveighthree", "583")
+                .replace("fiveightwo", "582")
+                .replace("fiveight", "58")
+                .replace("eighthree", "83")
+                .replace("eightwo", "82")
+                .replace("sevenineightwo", "7982")
+                .replace("sevenineighthree", "7983")
+                .replace("sevenineight", "798")
+                .replace("sevenine", "79")
+                .replace("nineight", "98")
+                .replace("one", "1")
+                .replace("two", "2")
+                .replace("three", "3")
+                .replace("four", "4")
+                .replace("five", "5")
+                .replace("six", "6")
+                .replace("seven", "7")
+                .replace("eight", "8")
+                .replace("nine", "9");
+
+            let numbers: Vec<u8> = line
+                .chars()
+                .into_iter()
+                .filter(|c| c.is_digit(10))
+                .map(|c| c.to_digit(10).unwrap() as u8)
+                .collect();
+
+            let sum: u32 = numbers[0] as u32 * 10 + *numbers.last().unwrap() as u32;
+            println!("{before} -> {line} => {numbers:?} => {sum}");
+            assert!(sum >= 10 && sum <= 99);
+            sum
+        })
+        .collect();
+    values.iter().sum()
+}
+
+fn main() {
+    let input = include_str!("../input.txt");
+
+    let part_1_output = part_1(input);
+    let part_2_output = part_2(input);
+
+    dbg!(part_1_output);
+    dbg!(part_2_output);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_1() {
+        let input = include_str!("../test_input_part_1.txt");
+
+        let output = part_1(input);
+        assert_eq!(output, 142);
+    }
+
+    #[test]
+    fn test_part_2() {
+        let input = include_str!("../test_input_part_2.txt");
+
+        let output = part_2(input);
+        assert_eq!(output, 281);
+    }
 }

day-01/test_input_part_1.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

day-01/test_input_part_2.txt

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen