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Problem Copy List with Random Pointer
Problem Description:
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.
Return a deep copy of the list.
Solution:
1 public RandomListNode copyRandomList(RandomListNode head) { 2 Map<RandomListNode, RandomListNode> map = new HashMap<RandomListNode, RandomListNode>(); 3 4 if (head == null) return null; 5 6 RandomListNode q = head; 7 RandomListNode p = null; 8 while (q != null ) { 9 p = new RandomListNode(q.label);10 map.put(q, p);11 q = q.next;12 } 13 14 q = head;15 RandomListNode root = map.get(head);16 while (q != null) {17 p = map.get(q);18 p.next = map.get(q.next);19 p.random = map.get(q.random);20 q = q.next;21 }22 23 return root;24 }
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