Merge K sorted Data Stream by using O(1) space
	
	/**
	 * How can you merge k sorted data streams using O(1) RAM? Also,
explain in
	 * detail how will you define the data stream object and its related
	 * functions/operations.
	 * 
	 * 
	 * e.g.
	 * 
	 * {
	 * 		2 -> 4 -> 8
	 * 		1 -> 5 -> 7 (*)
	 * 		3 -> 6 -> 12
	 * }
	 * 
	 * Output:
	 * 
	 * 		1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 -> 8 -> 12
	 * 
	 * */