MERGE TWO SORTED LISTS

Merge the two lists in a one sorted list.

EXPLANATION CODE:
1) This is a Java program that combines two sorted linked lists into a single sorted list. The two ListNode objects used as inputs by the procedure represent the heads of the two lists that will be combined. For the purpose of acting as a placeholder for the new list, it generates a new ListNode object named head with a value of 0. Three more ListNode objects are also created: temp, which will be used to navigate the new list; temp1 and temp2, which will be used to navigate the two input lists.

2) The method then enters a while loop that continues as long as both temp1 and temp2 are not null. In each iteration, it compares the values of temp1 and temp2 and appends the smaller one to the new list through temp.next. It then updates the corresponding ListNode object (temp1 or temp2) to its next node. Finally, it updates temp to the last added node in the new list.

3) After the while loop completes, the method checks if either temp1 or temp2 is not null, and if so, appends the remaining nodes to the new list through temp.next. It then returns the second node of the head, which is the start of the merged list.

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Contents:
0:00 - Reading
0:50 - Solving
3:25 - Explaining