public static LinkedNode <T> GetIntersectionNode <T>(LinkedNode <T> headA, LinkedNode <T> headB)
{
LinkedNode <T> A = headA, B = headB;
while (A != B)
{
A = A != null ? A.Next : headB;
B = B != null ? B.Next : headA;
}
return(A);
}
public void RemoveTargetNode(LinkedNode <T> target)
{
if (target.Next != null)
{
target.Value = target.Next.Value;
target.Next = target.Next.Next;
}
else
{
RemoveLast();
}
}
private static int GetListLength <T>(LinkedNode <T> head)
{
int count = 0;
while (head != null)
{
count++;
head = head.Next;
}
return(count);
}
public void AddLast(T newValue)
{
var newNode = new LinkedNode <T>(newValue);
if (Head == null)
{
Head = newNode;
}
else
{
Last().Next = newNode;
}
}
public static LinkedNode <T> RecursiveReserve <T>(LinkedNode <T> node)
{
if (node == null || node.Next == null)
{
return(node);
}
var temp = RecursiveReserve <T>(node.Next);
node.Next.Next = node;
node.Next = null;
return(temp);
}
public void Reverse()
{
var cur = Head;
LinkedNode <T> prev = null;
while (cur != null)
{
var temp = cur.Next;
cur.Next = prev;
prev = cur;
cur = temp;
}
Head = prev;
}
public static LinkedNode <T> DeleteNode <T>(LinkedNode <T> head, int val)
{
if (head.Value.Equals(val))
{
return(head.Next);
}
var prev = head;
while (prev.Next.Value.Equals(val))
{
prev = prev.Next;
}
prev.Next = prev.Next.Next;
return(head);
}
public static LinkedNode <T> Reverse <T>(LinkedNode <T> head)
{
var cur = head;
LinkedNode <T> prev = null;
while (cur != null)
{
var temp = cur.Next;
cur.Next = prev;
prev = cur;
cur = temp;
}
return(prev);
}
public static T MiddleValue <T>(LinkedNode <T> head)
{
var p1 = head;
var p2 = head;
while (p2.Next != null)
{
p1 = p1.Next;
p2 = p2.Next.Next;
if (p1 == p2)
{
throw new Exception("Cannot find middle value since linked list is circled");
}
}
return(p1.Value);
}
public static bool IsCircled <T>(LinkedNode <T> head)
{
var p1 = head;
var p2 = head;
while (p2.Next != null)
{
p1 = p1.Next;
p2 = p2.Next.Next;
if (p1 == p2)
{
return(true);
}
}
return(false);
}
public static LinkedNode <T> Append <T>(LinkedNode <T> head, T newValue)
{
var newNode = new LinkedNode <T>(newValue);
if (head == null)
{
return(newNode);
}
var node = head;
while (node.Next != null)
{
node = node.Next;
}
node.Next = newNode;
return(head);
}
public LinkedNode Sum(LinkedNode head1, LinkedNode head2)
{
if (head1 == null && head2 == null)
{
throw new Exception("Both input linked lists are empty");
}
if (head1 == null || head2 == null)
{
return(head1 ?? head2);
}
var preDigit = 0;
LinkedNode res = null;
LinkedNode head = null;
while (head1 != null || head2 != null || preDigit != 0)
{
var list1Val = head1?.Value ?? 0;
var list2Val = head2?.Value ?? 0;
var sum = list1Val + list2Val + preDigit;
var digitRes = sum % 10;
preDigit = sum / 10;
if (res == null)
{
res = new LinkedNode(digitRes);
head = res;
}
else
{
res.Next = new LinkedNode(digitRes);
res = res.Next;
}
head1 = head1?.Next;
head2 = head2?.Next;
}
return(head);
}
public static LinkedNode <T> DeleteNode2 <T>(LinkedNode <T> head, T val)
{
var cur = head;
LinkedNode <T> prev = null;
while (!cur.Value.Equals(val))
{
prev = cur;
cur = cur.Next;
}
if (prev == null)
{
head = head.Next;
}
else
{
prev.Next = cur.Next;
}
return(head);
}
public static LinkedNode <T> CommonNodeOfTwoLinkedList <T>(LinkedNode <T> headA, LinkedNode <T> headB)
{
var lengthA = GetListLength(headA);
var lengthB = GetListLength(headB);
var diff = lengthA - lengthB;
if (diff < 0)
{
var temp = headA;
headA = headB;
headB = temp;
diff = -diff;
}
while (diff > 0)
{
headA = headA.Next;
diff--;
}
while (headA != headB)
{
headA = headA.Next;
headB = headB.Next;
}
return(headA);
}
