https://leetcode.cn/problems/fu-za-lian-biao-de-fu-zhi-lcof/description/

/*
// Definition for a Node.
class Node {
    int val;
    Node next;
    Node random;

    public Node(int val) {
        this.val = val;
        this.next = null;
        this.random = null;
    }
}
*/
class Solution {
    public Node copyRandomList(Node head) {
        if (head == null) return null;
        Map<Node, Node> map = new HashMap<>();

        Node cur = head;
        while (cur != null) {
            map.put(cur, new Node(cur.val));
            cur = cur.next;
        } 

        cur = head;
        while (cur != null) {
            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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