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Sep 18th, 2019
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  1. class Solution:
  2. def reverseList(self, head: ListNode) -> ListNode:
  3. return self.helper(head, None)
  4.  
  5. def helper(self, node: ListNode, prev: ListNode) -> ListNode:
  6. if not node:
  7. return prev
  8. curr = node.next
  9. node.next = prev
  10. prev = node
  11. return self.helper(curr, prev)
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