在0（1）时间复杂度删除链表节点

/**
* Definition of ListNode
* class ListNode {
* public:
* int val;
* ListNode *next;
* ListNode(int val) {
* this->val = val;
* this->next = NULL;
* }
* }
*/
class Solution {
public:
/**
* @param node: a node in the list should be deleted
* @return: nothing
*/
void deleteNode(ListNode *node) {
// write your code here
node->val = node->next->val;
node->next=node->next->next;
}
};