2023-07-18 14:10:30 +0000 UTC

Reverse Linked List
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Code

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def reverseList(self, head: Optional[ListNode]) -> Optional[ListNode]:
        previous = None
        while head:
            next, head.next = head.next, previous
            previous, head = head, next

        return previous