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Copy path138. Copy List with Random Pointer
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138. Copy List with Random Pointer
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/*
// 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;
Node head2=null,ptr=head,last=head;
while(ptr!=null)
{
Node temp=new Node(ptr.val);
if(head2==null)
{
head2=temp;
last=temp;
}
else{
last.next=temp;
last=temp;
}
ptr=ptr.next;
}
ptr=head;
Node ptr2=head2;
while(ptr!=null)
{
if(ptr.random==null)
{
ptr2.random=null;
}
else{
Node temp=head;
int i=0,ind=0;
while(temp!=ptr.random){
ind+=1;
temp=temp.next;
}
temp=head2;
while(temp!=null&&i!=ind)
{
temp=temp.next;
i+=1;
}
ptr2.random=temp;
}
ptr=ptr.next;
ptr2=ptr2.next;
}
return head2;
}
}/*
// 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;
Node head2=null,ptr=head,last=head;
while(ptr!=null)
{
Node temp=new Node(ptr.val);
if(head2==null)
{
head2=temp;
last=temp;
}
else{
last.next=temp;
last=temp;
}
ptr=ptr.next;
}
ptr=head;
Node ptr2=head2;
while(ptr!=null)
{
if(ptr.random==null)
{
ptr2.random=null;
}
else{
Node temp=head;
int i=0,ind=0;
while(temp!=ptr.random){
ind+=1;
temp=temp.next;
}
temp=head2;
while(temp!=null&&i!=ind)
{
temp=temp.next;
i+=1;
}
ptr2.random=temp;
}
ptr=ptr.next;
ptr2=ptr2.next;
}
return head2;
}
}