Part 01

src/bin/part01.rs

@@ -0,0 +1,57 @@
+fn main() {
+    let lines = std::fs::read_to_string("src/bin/part01.txt")
+        .expect("Could not read file")
+        .lines()
+        .map(|line| line.parse::<String>().unwrap())
+        .collect::<Vec<_>>();
+
+    let mut sum = 0;
+
+    for i in 0..lines.len() {
+        let mut first_digit: Option<u32> = None;
+        let mut last_digit: Option<u32> = None;
+        let line = replace_string_numbers(lines[i].clone());
+
+        for c in line.chars() {
+            if c.is_digit(10) {
+                if first_digit.is_none() {
+                    first_digit = c.to_digit(10);
+                } else {
+                    last_digit = c.to_digit(10);
+                }
+            }
+        }
+        if last_digit.is_none() {
+            last_digit = first_digit;
+        }
+
+        sum += first_digit.unwrap() * 10 + last_digit.unwrap();
+
+        //println!("{}: {}{} -> {}", lines[i], first_digit.unwrap(), last_digit.unwrap(), sum);
+    }
+
+    println!("\nTotal sum: {}", sum);
+}
+
+fn replace_string_numbers(s: String) -> String {
+    let mut s = String::from(s);
+    s = s.replace("twone", "21");
+    s = s.replace("threeight", "38");
+    s = s.replace("nineight", "98");
+    s = s.replace("eightwo", "82");
+    s = s.replace("fiveight", "58");
+    s = s.replace("sevenine", "79");
+    s = s.replace("eighthree", "83");
+    s = s.replace("oneight", "18");
+    s = s.replace("one", "1");
+    s = s.replace("two", "2");
+    s = s.replace("three", "3");
+    s = s.replace("four", "4");
+    s = s.replace("five", "5");
+    s = s.replace("six", "6");
+    s = s.replace("seven", "7");
+    s = s.replace("eight", "8");
+    s = s.replace("nine", "9");
+
+    s
+}