用不带表头结点的循环单链表表示围成圆圈的n个人；要求建立此循环单链表；某人离席相当于删除一个结点，要正确设置程序中循环终止的条件和删除结点时指针的修改变化。-Header with a non-circular single linked list of nodes that a circle of n individuals called for the establishment of this circular single linked list someone leave equi