Deletion In Doubly Linked List

Easy

0/40

Average time to solve is 15m

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9 upvotes

Asked in companies

Problem statement

You are given a Doubly Linked List of ‘N’ positive integers. Your task is to delete a node at position ‘POS’ in the linked list.

Note:

Assume that the Indexing for the linked list starts from 0.

EXAMPLE:

Input: ‘N’ = 5, 'LIST' = [1, 1, 2, 3, 4, -1], ‘POS’ = 1.

Output: 1 < - > 2 < - > 3 < - > 4 

Here in the given list, we can see that the node at position 1 is deleted.

Detailed explanation ( Input/output format, Notes, Images )

Input Format :

The first line of input contains a single integer T, representing the number of test cases or queries to be run. 

The second line of the test case contains space-separated integers which are the nodes of the linked list and each line ends with -1 to indicate that the sublist is over. Thus, -1 will never be a linked list element.

The third line of each test case contains a single integer ‘POS’ denoting the position at which the node has to be deleted.

Output format :

The first and only line of each test case in the output contains the linked list after deleting the required element.

Note :

You don't need to print anything. It has already been taken care of. Just implement the given function.

Constraints :

1 <= ‘T’ <= 10 
2 <= ‘N’ <= 10^4 
0 <= ‘POS < N  
1 <= ‘data’ <= 10^7
Where 'N' is the size of the doubly linked list, and ‘data’ is the Integer data of the doubly linked list.

Time Limit: 1 sec

Sample Input 1 :

2
1 1 2 3 4 -1
1
1 2 -1
1

Sample Output 1 :

1 2 3 4
1

Explanation Of Sample Input 1 :

For the first test case,
‘N’ = 5, 'LIST' = [1, 1, 2, 3, 4, -1], ‘POS’ = 1.
After deleting the node at position 1 the list will be:
1 < - > 2 < - > 3 < - > 4.

For the second test case,
‘N’ = 2,  'LIST' = [1, 2, -1], ‘POS’ = 1.
After deleting the node at position 1 the list will be:
1.

Sample Input 2 :

Sample Output 2 :

2 3
3 4

Console