向一个栈顶指针为top的带头结点的非空的链栈中删除结点,则其操作步骤是( )
top->next=s;
s->next=top->next;top->next=s; free(s)
s = top;top= top->next;free(s)
s = top->next;top= top->next;free(s)
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