02.03. 删除中间节点

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输入：单向链表a->b->c->d->e->f中的节点c
结果：不返回任何数据，但该链表变为a->b->d->e->f

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class Solution(object):
    def deleteNode(self, node):
        """
        :type node: ListNode
        :rtype: void Do not return anything, modify node in-place instead.
        """
        node.val = node.next.val
        node.next = node.next.next