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Leetcode-Copy List with Random Pointer
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 /** 2 * Definition for singly-linked list with a random pointer. 3 * class RandomListNode { 4 * int label; 5 * RandomListNode next, random; 6 * RandomListNode(int x) { this.label = x; } 7 * }; 8 */ 9 public class Solution {10 public RandomListNode copyRandomList(RandomListNode head) {11 Map<RandomListNode,RandomListNode> map = new HashMap<RandomListNode,RandomListNode>();12 if (head==null) return null;13 14 RandomListNode head2 = new RandomListNode(head.label);15 map.put(head,head2);16 RandomListNode cur = head2;17 18 while (head!=null){19 RandomListNode rand1 = head.random;20 if (rand1!=null && map.containsKey(rand1)){21 cur.random = map.get(rand1);22 } else if (rand1!=null) {23 RandomListNode rand2 = new RandomListNode(rand1.label);24 map.put(rand1,rand2);25 cur.random = rand2;26 }27 28 if (head.next==null){29 cur.next=null;30 } else {31 RandomListNode next = head.next;32 if (map.containsKey(next))33 cur.next = map.get(next);34 else {35 RandomListNode next2 = new RandomListNode(next.label);36 cur.next = next2;37 map.put(next,next2);38 }39 }40 41 head = head.next;42 cur = cur.next;43 }44 45 return head2; 46 }47 }
Leetcode-Copy List with Random Pointer
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