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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.

Your Task:  
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

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N Digit numbers with digits in increasing order

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