LeetCode报错runtime error:member access within null pointer of type struct ListNode
在for循环中p指针在经过一个循环后P指针位置在NULL，所以在对q指针赋值时是用NULL空地址赋值，所以提示出错。 因此在while循环前加上判断P指针是否为NULL就可以解决。*p=head，head是指向第一个链表数据。
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