Task(easy)
Given a pointer to the head of a linked list, insert a new node before the head. The next value in the new node should point to head and the data value should be replaced with a given value. Return a reference to the new head of the list. The head pointer given may be null meaning that the initial list is empty.
Function Description
Complete the function insertNodeAtHead in the editor below.
insertNodeAtHead has the following parameter(s):
Input Format
The first line contains an integer n, the number of elements to be inserted at the head of the list.
The next n lines contain an integer each, the elements to be inserted, one per function call.
Constraints
1<n<1000
1<list[i]<1000
Sample Input
5
383
484
392
975
321
Sample Output
321
975
392
484
383
Solution 1
def insertNodeAtHead(llist, data):
# Write your code here
newNode = SinglyLinkedListNode(data)
if llist is None:
llist = newNode
else:
newNode.next = llist
llist = newNode
return llist
Solution 2
def insertNodeAtHead(llist, data):
new_node = SinglyLinkedListNode(data)
new_node.next = llist
return new_node
Explanation Steps
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