Day7

19. Remove Nth Node From End of List/Solution.cs

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+namespace _19._Remove_Nth_Node_From_End_of_List;
+
+public class Solution
+{
+    public ListNode? RemoveNthFromEnd(ListNode head, int n)
+    {
+        if (head.next == null)
+            return null;
+        ListNode? left = null;
+        ListNode? right = head;
+        n--;
+        while (n-- > 0)
+            right = right!.next;
+        while (right!.next != null)
+        {
+            if (left == null)
+                left = head;
+            else
+                left = left.next;
+            right = right.next;
+        }
+        if (left != null)
+        {
+            left.next = left.next!.next;
+            return head;
+        }
+        return head.next;
+    }
+}