题面 Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. 给定链表,交换相邻的两个节点,并非返回头节点. 样例 Given 1->2->3->4, you should return the list as 2->1->…
Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL. Initially, al…
题目内容 Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list’s nodes, only nodes itself may be changed.大概意思是说每两个节点为一组交换位置.只使用常量空间,不能修改链表的值,只能修改链表的指针 解法(迭代) class Solution { public: ListNode* s…