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- 已知有一个单向循环链表,其每一个结点中含三个域:pre,data和next,其中data为数据域,next为指向后继结点的指针域,pre也为指针域,但它的值为空(NULL),试编写算法将此单向循环链表改为双向循环链表,即使pre成为指向前驱结点的指针域。-Known to have a one-way circulation list, which each node contains three domains: pre, data and next, in which data for th