Advent 2023 Day 1

advent_of_code_2023/day1/main1.rs

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+use std::fs::read_to_string;
+
+fn main() {
+    let mut calibration = 0;
+
+    for line in read_to_string("input.txt").unwrap().lines() {
+        let mut first = 0;
+        let mut last = 0;
+        let mut set_first = false;
+
+        for char in line.chars() {
+            if char.is_ascii_digit() {
+                if !set_first {
+                    first = char as i32 - '0' as i32;
+                    set_first = true;
+                }
+                last = char as i32 - '0' as i32;
+            }
+        }
+
+        calibration += 10 * first + last;
+    }
+
+    println!("{}", calibration);
+}