public MyLinkedListNode AddLists(MyLinkedListNode list1, MyLinkedListNode list2, int carry)
{
if (list1 == null && list2 == null && carry == 0)
{
return(null);
}
var result = new MyLinkedListNodeDoubly();
var value = carry;
if (list1 != null)
{
value += (int)list1.Data;
}
if (list2 != null)
{
value += (int)list2.Data;
}
result.Data = value % 10;
if (list1 != null || list2 != null)
{
var more = AddLists(list1 == null ? null : list1.Next,
list2 == null ? null : list2.Next,
value >= 10 ? 1 : 0);
result.SetNext(more);
}
return(result);
}
/// <summary>
/// Delete dups using additional memory (e.g. Hash table or Dictionary)
/// </summary>
/// <param name="head"></param>
public void DeleteDups_UsingDictionary(MyLinkedListNodeDoubly head)
{
Console.WriteLine($"{this.GetType().FullName}.{System.Reflection.MethodBase.GetCurrentMethod().Name}\n");
head.PrintForward("List-Before:");
var dictionaryTable = new Dictionary <int, bool>();
MyLinkedListNodeDoubly previous = null;
while (head != null)
{
if (dictionaryTable.ContainsKey((int)head.Data))
{
if (previous != null)
{
previous.Next = head.Next;
}
}
else
{
dictionaryTable.Add((int)head.Data, true);
previous = head;
}
head = (MyLinkedListNodeDoubly)head.Next;
}
Console.WriteLine($"dictionaryTable =[{string.Join(", ", dictionaryTable.Keys)}]");
if (head != null)
{
head.PrintForward("List-After\n");
}
Console.WriteLine("-------------------------------------------------------");
}
public void Run()
{
const int length = 10;
var nodes = new MyLinkedListNodeDoubly[length];
for (var i = 0; i < length; i++)
{
nodes[i] = new MyLinkedListNodeDoubly(i >= length / 2 ? length - i - 1 : i, null, null);
}
for (var i = 0; i < length; i++)
{
if (i < length - 1)
{
nodes[i].SetNext(nodes[i + 1]);
}
if (i > 0)
{
nodes[i].SetPrevious(nodes[i - 1]);
}
}
// nodes[length - 2].data = 9; // Uncomment to ruin palindrome
var head = nodes[0];
head.PrintForward("Original:");
Console.WriteLine("\nIsPalindrome: " + IsPalindrome_UsingRecursionMain(head));
Console.WriteLine("\nIsPalindrome2: " + IsPalindrome_UsingStack(head));
}
public MyLinkedListNode Partition3(MyLinkedListNode listHead, int pivot)
{
var leftList = new MyLinkedListNodeDoubly(); // empty temp node to not have an IF inside the loop
var rightList = new MyLinkedListNodeDoubly(pivot, null, null);
var leftListHead = leftList; // Used at the end to remove the empty node.
var rightListHead = rightList; // Used at the end to merge lists.
var currentNode = listHead;
while (currentNode != null)
{
if ((int)currentNode.Data < pivot)
{
leftList = new MyLinkedListNodeDoubly(currentNode.Data, null, leftList);
}
else if ((int)currentNode.Data > pivot)
{
rightList = new MyLinkedListNodeDoubly(currentNode.Data, null, rightList);
}
currentNode = currentNode.Next;
}
leftList.Next = rightListHead;
var finalList = leftListHead.Next;
leftListHead.Next = null; // remove the temp node, GC will release the mem
return(finalList);
}
public void DeleteDups_Run()
{
Console.WriteLine($"{this.GetType().FullName}.{System.Reflection.MethodBase.GetCurrentMethod().Name}");
var first = new MyLinkedListNodeDoubly(0, null, null);
var originalList = first;
var second = first;
for (var i = 1; i < 8; i++)
{
second = new MyLinkedListNodeDoubly(i % 2, null, null);
first.SetNext(second);
second.SetPrevious(first);
first = second;
}
originalList.PrintForward("originalList");
var list1 = originalList.CloneLinkedListNodeDoubly();
var list2 = originalList.Clone();
var list3 = originalList.Clone();
var list4 = originalList.Clone();
DeleteDups_UsingDictionary(list1);
DeleteDups_UsingTwoPointer(list2);
//DeleteDupsC_InProgress(list3);
//DeleteDupsC2_InProgress(list4);
}
public void Run()
{
/* Create linked list */
int[] vals = { 1, 3, 7, 5, 2, 9, 4 };
var head = new MyLinkedListNodeDoubly(vals[0], null, null);
var current = head;
for (var i = 1; i < vals.Length; i++)
{
current = new MyLinkedListNodeDoubly(vals[i], null, current);
}
head.PrintForward("Original:");
var head2 = head.Clone();
var head3 = head.Clone();
var head4 = head.Clone();
/* Partition */
var h = Partition(head, 5);
var h2 = Partition2(head2, 5);
var h3 = Partition3(head3, 5);
var h4 = Partition4(head4, 5);
/* Print Result */
h.PrintForward("Partition:");
h2.PrintForward("Partition2");
h3.PrintForward("Partition3");
h4.PrintForward("Partition4");
}
public void SetPrevious(MyLinkedListNodeDoubly p)
{
Prev = p;
if (p != null && p.Next != this)
{
p.SetNext(this);
}
}
public void Run()
{
#region First Part
{
var lA1 = new MyLinkedListNodeDoubly(9, null, null);
var lA2 = new MyLinkedListNodeDoubly(9, null, lA1);
var lA3 = new MyLinkedListNodeDoubly(9, null, lA2);
var lB1 = new MyLinkedListNodeDoubly(1, null, null);
var lB2 = new MyLinkedListNodeDoubly(0, null, lB1);
var lB3 = new MyLinkedListNodeDoubly(0, null, lB2);
var list3 = AddLists(lA1, lB1, 0);
lA1.PrintForward("");
lB1.PrintForward("+");
list3.PrintForward("=");
var l1 = LinkedListToInt(lA1);
var l2 = LinkedListToInt(lB1);
var l3 = LinkedListToInt(list3);
Console.Write(l1 + " + " + l2 + " = " + l3 + "\n");
Console.WriteLine(l1 + " + " + l2 + " = " + (l1 + l2));
}
#endregion First Part
#region Followup
{
var lA1 = new MyLinkedListNodeDoubly(3, null, null);
var lA2 = new MyLinkedListNodeDoubly(1, null, lA1);
//LinkedListNode lA3 = new LinkedListNode(5, null, lA2);
var lB1 = new MyLinkedListNodeDoubly(5, null, null);
var lB2 = new MyLinkedListNodeDoubly(9, null, lB1);
var lB3 = new MyLinkedListNodeDoubly(1, null, lB2);
var list3 = AddLists2(lA1, lB1);
lA1.PrintForward("");
lB1.PrintForward("+");
list3.PrintForward("=");
var l1 = linkedListToInt(lA1);
var l2 = linkedListToInt(lB1);
var l3 = linkedListToInt(list3);
Console.Write(l1 + " + " + l2 + " = " + l3 + "\n");
Console.WriteLine(l1 + " + " + l2 + " = " + (l1 + l2));
}
#endregion Followup
}
public static MyLinkedListNode CreateLinkedListFromArray(int[] vals)
{
MyLinkedListNode head = new MyLinkedListNodeDoubly(vals[0], null, null);
MyLinkedListNodeDoubly current = (MyLinkedListNodeDoubly)head;
for (int i = 1; i < vals.Length; i++)
{
current = new MyLinkedListNodeDoubly(vals[i], null, current);
}
return(head);
}
public MyLinkedListNodeDoubly CloneLinkedListNodeDoubly()
{
MyLinkedListNodeDoubly next2 = null;
if (Next != null)
{
next2 = (MyLinkedListNodeDoubly)((MyLinkedListNode)Next).Clone();
}
MyLinkedListNodeDoubly head2 = new MyLinkedListNodeDoubly(Data, next2, null);
return(head2);
}
public MyLinkedListNode insertBefore(MyLinkedListNode list, int data)
{
var listD = (MyLinkedListNodeDoubly)list;
var node = new MyLinkedListNodeDoubly(data, null, null);
if (listD != null)
{
listD.Prev = node;
node.Next = listD;
}
return(node);
}
public static MyLinkedListNode LinkedListWithValue(int N, int value)
{
MyLinkedListNode root = new MyLinkedListNodeDoubly(value, null, null);
MyLinkedListNode prev = root;
for (int i = 1; i < N; i++)
{
MyLinkedListNode next = new MyLinkedListNodeDoubly(value, null, null);
prev.SetNext(next);
prev = next;
}
return(root);
}
public override void SetNext(MyLinkedListNode n)
{
MyLinkedListNodeDoubly newNextNode = (MyLinkedListNodeDoubly)n;
Next = newNextNode;
if (this == CurrentNode)
{
CurrentNode = newNextNode;
}
if (n != null && newNextNode.Prev != this)
{
newNextNode.SetPrevious(this);
}
}
public static MyLinkedListNode GetLinkedListDoubly_Random(int N, int min, int max)
{
MyLinkedListNode root = new MyLinkedListNodeDoubly(AssortedMethods.RandomIntInRange(min, max), null, null);
MyLinkedListNode prev = root;
for (int i = 1; i < N; i++)
{
int data = AssortedMethods.RandomIntInRange(min, max);
MyLinkedListNode next = new MyLinkedListNodeDoubly(data, null, null);
prev.SetNext(next);
prev = next;
}
return(root);
}
public MyLinkedListNode PadList(MyLinkedListNode listNode, int padding)
{
var head = (MyLinkedListNodeDoubly)listNode;
for (var i = 0; i < padding; i++)
{
var n = new MyLinkedListNodeDoubly(0, null, null);
head.Prev = n;
n.Next = head;
head = n;
}
return(head);
}
public MyLinkedListNode Cycle_Create()
{
const int listLength = 10;
const int k = 3;
// Create linked list
var nodes = new MyLinkedListNode[listLength];
for (var i = 1; i <= listLength; i++)
{
nodes[i - 1] = new MyLinkedListNodeDoubly(i, null, i - 1 > 0 ? (MyLinkedListNodeDoubly)nodes[i - 2] : null);
Console.Write("{0} -> ", nodes[i - 1].Data);
}
// Create loop;
Console.WriteLine($"\n Create loop: nodes[listLength - 1].Next = nodes[listLength - k - 1]");
nodes[listLength - k - 1].PrintForward("nodes[listLength - k - 1]");
nodes[listLength - 1].PrintForward("nodes[listLength - 1]");
nodes[listLength - 1].Next = nodes[listLength - k - 1];
Console.WriteLine("\n{0} -> {1}", nodes[listLength - 1].Data, nodes[listLength - k - 1].Data);
Console.WriteLine("Nodes:\n");
return(nodes[0]);
}
public MyLinkedListNodeDoubly(object d, MyLinkedListNodeDoubly n, MyLinkedListNodeDoubly p)
{
Data = d;
SetNext(n);
SetPrevious(p);
}
