LeetCode：Delete Node in a Linked List

问题描述：

Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.

Supposed the linked list is

1 -> 2 -> 3 -> 4

and you are given the third node with value

3

,
the linked list should become

1 -> 2 -> 4

after calling your function.
代码：

/**
* Definition for singly-linked list.
* struct ListNode {
*     int val;
*     ListNode *next;
*     ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
void deleteNode(ListNode* node) {
ListNode *p = node -> next;
node -> val = p -> val;
node -> next = p -> next;
free (p);
}
};