swap_nodes_in_pairs
swap_nodes_in_pairs.py 源码
# 两两交换链表节点
class ListNode:
def __init__(self, val=0, next=None):
self.val = val
self.next = next
class Solution:
# 迭代
def swapPairs_1(self, head: ListNode) -> ListNode:
dummy = ListNode()
p, dummy.next = dummy, head
while p.next and p.next.next:
prev, back = p.next, p.next.next
p.next, prev.next, back.next = back, back.next, prev
p = p.next.next
return dummy.next
# 递归
def swapPairs_2(self, head: ListNode) -> ListNode:
if not head or not head.next:
return head
cur = head.next
head.next = self.swapPairs_2(cur.next)
cur.next = head
return cur
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