2023每日刷题(八十七)
Leetcode—24. 两两交换链表中的节点
实现代码
/*** Definition for singly-linked list.* struct ListNode {* int val;* ListNode *next;* ListNode() : val(0), next(nullptr) {}* ListNode(int x) : val(x), next(nullptr) {}* ListNode(int x, ListNode *next) : val(x), next(next) {}* };*/
class Solution {
public:ListNode* swapPairs(ListNode* head) {ListNode* dummy = new ListNode(0, head);ListNode* tmp = head;int n = 0;while(tmp) {n++;tmp = tmp->next;}if(n == 0 || n == 1) {return head;}ListNode* p0 = dummy, *pre = nullptr;ListNode* cur = head;for(; n >= 2; n -= 2) {for(int i = 0; i < 2; i++) {ListNode* nxt = cur->next;cur->next = pre;pre = cur;cur = nxt;}ListNode* nxxt = p0->next;p0->next->next = cur;p0->next = pre;p0 = nxxt;}return dummy->next;}
};
运行结果
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