DSA Level 2 Data Structures Linked List Add First In Doubly Linkedlist

Add First In Doubly Linkedlist

easy

1. You are given a partially written DoublyLinkedList class.
2. You are required to complete the body of addFirst function. This function is supposed to add an element to the front of LinkedList. You are required to update head, tail and size as required.
3. Input and Output is managed for you. Just update the code in addFirst function.

Note -&gt; Use the code snippet and follow the algorithm discussed in question video. The judge can't 
        force you but the intention is to teach a concept. Play in spirit of the question.

Input Format

input in managed for you.

Output Format

output in managed for you.

Constraints

0 &lt;= N &lt;= 10^6

Notice

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Notice :

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed appro

Example

Input

addFirst 10
addFirst 20
addFirst 30
stop

Output

[30, 20, 10]

Segregate Node Of Linkedlist Over Pivot Index

Add Last In Doubly Linkedlist

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