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Copy List with Random Pointer.java
44 lines (40 loc) · 1.15 KB
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Copy List with Random Pointer.java
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/**
* Definition for singly-linked list with a random pointer.
* class RandomListNode {
* int label;
* RandomListNode next, random;
* RandomListNode(int x) { this.label = x; }
* };
*/
public class Solution {
public RandomListNode copyRandomList(RandomListNode head) {
if(head == null){
return head;
}
RandomListNode node = head;
while(node!=null){
RandomListNode newNode = new RandomListNode(node.label);
newNode.next = node.next;
node.next = newNode;
node = newNode.next;
}
node = head;
while(node!=null){
if(node.random!=null){
node.next.random = node.random.next;
}
node = node.next.next;
}
RandomListNode newHead = head.next;
node = head;
while(node!=null){
RandomListNode newNode = node.next;
node.next = newNode.next;
if(newNode.next!=null){
newNode.next = newNode.next.next;
}
node = node.next;
}
return newHead;
}
}