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DSA Pythonprogramming~10 mins

Reverse a Singly Linked List Recursive in DSA Python - Interactive Practice

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Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to return the base case node in the recursive reverse function.

DSA Python
def reverse_recursive(node):
    if node is None or node.next is None:
        return [1]
Drag options to blanks, or click blank then click option'
Anode
Bnode.next
CNone
Dnode.prev
Attempts:
3 left
💡 Hint
Common Mistakes
Returning node.next causes None to be returned incorrectly.
Returning node.prev is invalid for singly linked list.
2fill in blank
medium

Complete the code to recursively reverse the rest of the list after the current node.

DSA Python
def reverse_recursive(node):
    if node is None or node.next is None:
        return node
    new_head = [1]
Drag options to blanks, or click blank then click option'
Areverse_recursive(node.prev)
Breverse_recursive(node)
Creverse_recursive(node.next)
Dreverse_recursive(None)
Attempts:
3 left
💡 Hint
Common Mistakes
Calling reverse_recursive(node) causes infinite recursion.
Calling reverse_recursive(node.prev) is invalid for singly linked list.
3fill in blank
hard

Fix the error in the code to correctly reverse the link between nodes.

DSA Python
def reverse_recursive(node):
    if node is None or node.next is None:
        return node
    new_head = reverse_recursive(node.next)
    node.next.next = [1]
    node.next = None
    return new_head
Drag options to blanks, or click blank then click option'
Anew_head
Bnode
CNone
Dnode.next
Attempts:
3 left
💡 Hint
Common Mistakes
Setting node.next.next to None breaks the chain.
Setting node.next.next to new_head causes incorrect links.
4fill in blank
hard

Fill both blanks to complete the recursive reversal and break the old link.

DSA Python
def reverse_recursive(node):
    if node is None or node.next is None:
        return node
    new_head = reverse_recursive([1])
    [2].next.next = node
    node.next = None
    return new_head
Drag options to blanks, or click blank then click option'
Anode.next
Bnode
Cnew_head
DNone
Attempts:
3 left
💡 Hint
Common Mistakes
Using new_head in place of node.next causes errors.
Setting node.next.next to new_head breaks the link.
5fill in blank
hard

Fill all three blanks to complete the recursive function that reverses a singly linked list.

DSA Python
def reverse_recursive(node):
    if node is None or node.next is None:
        return [1]
    new_head = reverse_recursive([2])
    [3].next.next = node
    node.next = None
    return new_head
Drag options to blanks, or click blank then click option'
Anode
Bnode.next
Dnew_head
Attempts:
3 left
💡 Hint
Common Mistakes
Returning node.next in base case is wrong.
Using new_head instead of node.next for link reversal causes errors.