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Create 24.py #2

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11 changes: 11 additions & 0 deletions Week_01/id_19/24.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@

class Solution:
def swapPairs(self, head):
dummy = pre = ListNode(0)
pre.next = head
while pre.next and pre.next.next:
a = pre.next
b = a.next
pre.next, a.next, b.next = b, b.next, a
pre = a
return dummy.next