[LeetCode]Copy List with Random Pointer

题意：这个题目也是个蛮有意思的题目，就是对一个有随机指针的链表进行深拷贝，
思路：简单地来说就是递归拷贝，然后呢防止重复拷贝，所以凡是拷贝过得内存地址都得记录下来
代码：

    Map<RandomListNode, RandomListNode> m = new HashMap<RandomListNode, RandomListNode>();
    //保存已经copy的部分

    public RandomListNode copyRandomList(RandomListNode head) {
        RandomListNode rList = null;
        if(head == null) return rList;
        else {
            rList = new RandomListNode(head.label);
            m.put(head, rList);
            if(m.get(head.next) != null){
                rList.next = m.get(head.next);
            }else
                rList.next = copyRandomList(head.next);
            if(m.get(head.random) != null) {
                rList.random = m.get(head.random);
            }else
                rList.random = copyRandomList(head.random);
        }

        return rList;
    }

[LeetCode]Copy List with Random Pointer

原文：http://blog.csdn.net/youmengjiuzhuiba/article/details/45768711