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21 lines
466 B
Python
21 lines
466 B
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# author: bt3gl
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class ListNode:
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def __init__(self, val=0, next=None):
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self.val = val
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self.next = next
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def reverse_list(head: Optional[ListNode]) -> Optional[ListNode]:
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if (not head) or (not head.next):
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return head
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new_head = reverse_list(head.next)
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head.next.next = head
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head.next = None
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return new_head
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