public void LinkedListIntv_CopyRandomListTest1()
{
RandomListNode l0 = new RandomListNode(0),
l1 = new RandomListNode(1),
l2 = new RandomListNode(2),
l3 = new RandomListNode(3),
l4 = new RandomListNode(4);
l0.Next = l1;
l1.Next = l2;
l2.Next = l3;
l3.Next = l4;
l0.Random = l2;
l3.Random = l0;
RandomListNode r = CopyRandomList(l0);
Assert.AreEqual(0, r.Label);
Assert.AreEqual(2, r.Random.Label); r = r.Next;
Assert.AreEqual(1, r.Label); r = r.Next;
Assert.AreEqual(2, r.Label); r = r.Next;
Assert.AreEqual(3, r.Label);
Assert.AreEqual(0, r.Random.Label); r = r.Next;
Assert.AreEqual(4, r.Label);
}
public static RandomListNode CopyRandomList(RandomListNode head)
{
if (null == head)
{
return(null);
}
RandomListNode result = null,
pold = head,
pnew = result,
poldNext = null;
do
{
poldNext = pold.Next;
pnew = new RandomListNode(pold.Label);
pold.Next = pnew;
pnew.Next = poldNext;
if (result == null)
{
result = pnew;
}
pold = poldNext;
}while(pold != null);
pold = head;
while (pold != null)
{
if (pold.Random != null)
{
pold.Next.Random = pold.Random.Next;
}
pold = pold.Next.Next;
}
pold = head;
pnew = result;
while (pnew.Next != null)
{
pold.Next = pnew.Next;
pold = pold.Next;
pnew.Next = pold.Next;
pnew = pnew.Next;
}
pold.Next = null;
pnew.Next = null;
return(result);
}