variable-pointer list 可变指标表
When you assign any list to a variable, you're really assigning a pointer or reference to the list.
当您将一个变量赋值给任何列表时，您就为该列表分配了一个指针或引用。
To have a variable hold this kind of list in a program, all you need is to have a pointer that points to type struct ll_int_node.
要在程序中使用一个变量来容纳这种链表，您需要做的只是使用一个指向类型struct ll_int _ node的指针。
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