Find all combinations of given length
MEDIUMGiven a string of unique (non-repeating) numbers separated by a single space (elements).
The next line contains the number of elements in the combination (k).
1 ≤ k ≤ count of elements
Find all combinations of given length. Print it in any order.
Example #1
Input
1 2 3 2
Output
1 1 1 2 1 3 2 1 2 2 2 3 3 1 3 2 3 3