AOC 2023: day1, part1.

2023/rust/day1/example

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

2023/rust/day1/src/main.rs

@@ -1,3 +1,26 @@
-fn main() {
+use std::fs::read_to_string;
-    println!("Hello, world!");
+
+fn part1(str: &String) -> Vec<u32> {
+    let mut num_vec = Vec::new(); 
+    let line : Vec<&str> = str.split('\n').collect();
+    for l in line {
+        let num : Vec<u8> = l.as_bytes().iter().filter(|ch| ch.is_ascii_digit()).cloned().collect();
+        let mut str_num = String::new();
+        if num.len() >= 2 {
+            str_num.push(num.first().unwrap().clone() as char);
+            str_num.push(num.last().unwrap().clone() as char);
+        } else {
+            str_num.push(num.first().unwrap().clone() as char);
+            str_num.push(num.first().unwrap().clone() as char);
+        }
+        num_vec.push(str_num);
+    }
+    println!("{:?}", num_vec);
+    num_vec.iter().map(|str| str.parse().unwrap()).collect()
+}
+
+fn main() {
+    let str = read_to_string("input").unwrap();
+    let part1_result : u32 = part1(&str).iter().sum();
+    println!("total part1: {}", part1_result);
 }