Problem title
Difficulty
Avg time to solve

Find the K-th Smallest Element in Array
Easy
10 mins
Median of a row wise sorted matrix
Moderate
30 mins
Minimum Number Of Swaps For Bracket Balancing
Moderate
15 mins
Minimum Rotations
Easy
10 mins
Rotate DLL
Moderate
10 mins
Minimum shift Operations
Moderate
30 mins
Optimum Location
Hard
45 mins
Isomorphic Strings
Easy
15 mins
Merge Sort In-Place
Easy
--
First Bad Version
Easy
10 mins
1

MergeSort Linked List

Difficulty: MEDIUM
Avg. time to solve
25 min
Success Rate
75%

Problem Statement

 Given a singly linked list of integers, sort it using 'Merge Sort.'

Note :
No need to print the list, it has already been taken care. Only return the new head to the list.
Input format :
The first line contains an Integer 't' which denotes the number of test cases or queries to be run. Then the test cases follow.

The first and the only line of each test case or query contains the elements of the singly linked list separated by a single space.
Remember/Consider :
While specifying the list elements for input, -1 indicates the end of the singly linked list and hence, would never be a list element
Output format :
For each test case/query, print the elements of the sorted singly linked list.

Output for every test case will be printed in a seperate line.
Constraints :
1 <= t <= 10^2
0 <= M <= 10^5
Where M is the size of the singly linked list.

Time Limit: 1sec
Sample Input 1 :
1
10 9 8 7 6 5 4 3 -1
Sample Output 1 :
 3 4 5 6 7 8 9 10 
 Sample Output 2 :
2
-1
10 -5 9 90 5 67 1 89 -1
Sample Output 2 :
-5 1 5 9 10 67 89 90 
Reset Code
Full screen
copy-code
Console