2023 day1 part1

Author: rrrlw

2023/day1part1.py

@@ -0,0 +1,19 @@
+# utility functions
+def first_digit(input_str):
+    for curr_ch in input_str:
+        if curr_ch.isdigit():
+            return curr_ch
+    
+    return -1
+
+def last_digit(input_str): return first_digit(reversed(input_str))
+
+# input & process line-by-line
+counter = 0
+with open("day1.in", "r") as fin:
+    for line in fin:
+        curr = int(first_digit(line) + last_digit(line))
+        counter += curr
+
+# output
+print(counter)