面试题35. 复杂链表的复制(剑指offer)java

面试题35. 复杂链表的复制

面试题35. 复杂链表的复制

思路:

class Solution {
    public Node copyRandomList(Node head) {
        //建立指针cur,指向head
        Node cur = head;
        //新建HashMap
        HashMap<Node, Node> map = new HashMap<>();

        //当cur指向不为空
        while (cur != null) {
            //往hashmap中添加原链表cur指向的节点,以及新链表对应的值
            map.put(cur, new Node(cur.val));
            //指针指向原链表下一个节点
            cur = cur.next;
        }

        cur = head;
        while (cur != null) {
            //新链表关系链接
            map.get(cur).next = map.get(cur.next);
            map.get(cur).random = map.get(cur.random);
            cur = cur.next;
        }

        return map.get(head);
    }
}

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