Backtracking algorithm tutorial with Example

Problem number 1:

Print k numbers in total N numbers. Using Backtracking 

Solution:

Input:

Array Size: 
5
Array Elements:
1 2 3 4 5

Print how many numbers in this array.

Example input :
2

Then we show this output:

1 2,  1 3,  1 4,  1 5,  2 1,  2 3,  2 4,  2 5,  3 1,  3 2,  3 4,  3 5,  4 1,  4 2,  4 3,  4 5,  5 1,  5 2,  5 3,  5 4

We show print 20 ways in 2 numbers of 5 elements array.


Code: