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Update swap_every_two_nodes.py

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marina 2023-08-07 15:54:37 -07:00 committed by GitHub
parent 93c18361f3
commit 69d068678b
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1 changed files with 3 additions and 4 deletions
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linked_lists/swap_every_two_nodes.py
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@ -3,21 +3,20 @@
# author: bt3gl # author: bt3gl
class ListNode: class Node:
def __init__(self, val=0, next=None): def __init__(self, val=0, next=None):
self.val = val self.val = val
self.next = next self.next = next
def swap_pairs(head: Optional[ListNode]) -> Optional[ListNode]: def swap_pairs(head: Optional[Node]) -> Optional[Node]:
if not head or not head.next: if not head or not head.next:
return head return head
## nodes to be swapped
first_node = head first_node = head
second_node = head.next second_node = head.next
# swapping
first_node.next = swap_pairs(second_node.next) first_node.next = swap_pairs(second_node.next)
second_node.next = first_node second_node.next = first_node