Day1 Rust

day1/rust/src/main.rs

@@ -0,0 +1,44 @@
+fn main() {
+    let part2 = true;
+    let english_digit_names = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+
+
+    let stdin = std::io::stdin();
+    let mut sum = 0;
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let mut first: Option<u32> = None;
+        let mut last = 0;
+        for i in 0..line.chars().count() {
+            let slice = &line[i..];
+
+            let first_char = slice.chars().next().unwrap();
+            if first_char.is_digit(10) {
+                if first == None {
+                    first = first_char.to_digit(10);
+                }
+
+                last = first_char.to_digit(10).unwrap();
+            }
+
+            if part2 {
+                for (i, name) in english_digit_names.iter().enumerate() {
+                    if slice.starts_with(name) {
+                        if first == None {
+                            first = Some(i.try_into().unwrap());
+                        }
+
+                        last = i.try_into().unwrap();
+                    }
+                }
+            }
+        }
+
+        sum += first.unwrap() * 10;
+        sum += last;
+    }
+
+    println!("{}", sum);
+}