leet237- Delete Node in a Linked List
难度：easy
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.
思路：一道get不到重点的题目，要求在不知道首表的条件下，删除链表中的一个node。一般删除节点是通过上一个节点来操作的。由于此题中只有当前节点，于是就将当年节点的值赋予下一位节点，然后删除下一个节点。----下一个节点死的真冤。