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N Digit numbers with digits in increasing order
Medium Accuracy: 51.37% Submissions: 327 Points: 4

Given an integer N, print all the N digit numbers in increasing order, such that their digits are in strictly increasing order(from left to right).

Example 1:

Input:
N = 1
Output:
0 1 2 3 4 5 6 7 8 9
Explanation:
Single digit numbers are considered to be
strictly increasing order.


Example 2:

Input:
N = 2
Output:
12 13 14 15 16 17 18 19 23....79 89
Explanation:
For N = 2, the correct sequence is
12 13 14 15 16 17 18 19 23 and so on
up to 89.

You don't need to read input or print anything. Your task is to complete the function increasingNumbers() which takes an integer N as an input parameter and return the list of numbers such that their digits are in strictly increasing order.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

Constraints:
1 <= N <= 9