public RandomListNode CopyRandomList(RandomListNode head)
{
if (head == null)
{
return(null);
}
Dictionary <RandomListNode, RandomListNode> hm = new Dictionary <RandomListNode, RandomListNode>();
RandomListNode newHead = new RandomListNode(head.label);
hm.Add(head, newHead);
RandomListNode p = head;
RandomListNode q = newHead;
p = p.next;
while (p != null)
{
RandomListNode temp = new RandomListNode(p.label);
hm.Add(p, temp);
p = p.next;
q.next = temp;
q = temp;
}
p = head;
q = newHead;
while (p != null)
{
if (p.random != null)
{
q.random = hm[p.random];
}
else
{
q.random = null;
}
p = p.next;
q = q.next;
}
return(hm[head]);
}
public void AppendToTaile(int data, int radom_data)
{
if (head == null)
{
head = new RandomListNode(data);
head.next = null;
head.random = null;
}
else
{
RandomListNode n = new RandomListNode(data);
n.next = null;
n.random = null;
RandomListNode temp = head;
while (temp.next != null)
{
temp = temp.next;
}
temp.next = n;
}
}
/*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.*/
public RandomListNode CopyRandomList(RandomListNode head)
{
if (head == null)
{
return(null);
}
//map <originalNode, newNode>
Dictionary <RandomListNode, RandomListNode> mp = new Dictionary <RandomListNode, RandomListNode>();
RandomListNode res = new RandomListNode(0);
RandomListNode p = head;
RandomListNode q = res;
while (p != null)
{
RandomListNode tmp = new RandomListNode(p.label);
q.next = tmp;
mp[p] = tmp;
p = p.next;
q = q.next;
}
p = head;
q = res.next;
while (p != null)
{
if (p.random == null)
{
q.random = null;
}
else
{
q.random = mp[p.random];
}
p = p.next;
q = q.next;
}
return(res.next);
}
