solution 03-12-2025

03-12-2025/main.rs

@@ -0,0 +1,48 @@
+use std::fs;
+
+fn main() {
+    // let input = [
+    //     "987654321111111",
+    //     "811111111111119",
+    //     "234234234234278",
+    //     "818181911112111",
+    // ];
+
+    let input: String =
+        fs::read_to_string("input.txt").expect("text file cannot be read to string");
+    let input = input.split("\n");
+    let mut res = 0;
+
+    for el in input {
+        if el == "" {
+            break;
+        }
+        let length = el.chars().count() - 1;
+        let numbers: Vec<u32> = el
+            .chars()
+            .collect::<Vec<_>>()
+            .iter()
+            .map(|c| c.to_digit(10).unwrap())
+            .collect();
+        let first_num = max_number(&numbers, 0, length);
+        let second_num = max_number(&numbers, first_num.1 + 1, length + 1);
+        res += concat_f(first_num.0, second_num.0);
+    }
+    println!("{}", res);
+}
+
+fn max_number(numbers: &Vec<u32>, start: usize, end: usize) -> (u32, usize) {
+    let mut max: u32 = numbers[start];
+    let mut max_idx: usize = 0;
+    for i in start..end {
+        if numbers[i] > max {
+            max = numbers[i];
+            max_idx = i;
+        }
+    }
+    (max, max_idx)
+}
+
+fn concat_f(a: u32, b: u32) -> u64 {
+    format!("{}{}", a, b).parse().unwrap()
+}