Given two sorted linked lists consisting of N and M nodes respectively. The task is to merge both of the list (in-place) and return head of the merged list.

Note: It is strongly recommended to do merging in-place using O(1) extra space.

First line of input contains number of testcases T. For each testcase, first line of input contains N and M, and next two line contains N and M sorted elements in two lines for each.

For each testcase, print the merged list in sorted form.

User Task:
The task is to complete the function sortedMerge() which takes references to the heads of two linked lists as the arguments and returns the head of merged linked list.

1 <= T <= 200
1 <= N, M <= 103
1 <= Node's data <= 103


4 3
5 10 15 40 
2 3 20
2 2
1 1
2 4 

2 3 5 10 1
5 20 40
1 1 2 4

Testcase 1:
After merging the two linked lists, we have merged list as 2, 3, 5, 10, 15, 20, 40.


** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal
Author: kartik

If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.

Need help with your code? Please use, generate link and share the link here.

to report an issue on this page.