Combinatorial Lock

You are tasked with designing a combinatorial lock with a specified number of digits. Each digit can range from 0 to 9. Write a program to find all possible combinations of the lock for a given number of digits. Your program should read an integer N from the input, which represents the number of digits in the lock, and then print all valid combinations in ascending order, each on a new line. Example Input: 2 Example Output: 00 01 02 03 04 05 06 07 08 09 10 11 12 ... up to 99.