Leetcode - 24. Swap Nodes in Pairs

문제

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LeetCode

정답

class Solution:
    def swapPairs(self, head: Optional[ListNode]) -> Optional[ListNode]:
        dummy = head
        while head and head.next:
            adj = head.next
            head.val, adj.val = adj.val, head.val

            head = head.next.next
        return dummy