LC#83 remove duplicate nodes form the sorted linked list- recursive, iterative solution

Author: NirmalSilwal

Leetcode/leetcodeTags/LinkedList/RemoveDuplicatesFromSortedList83.java

@@ -0,0 +1,58 @@
+package LinkedList;
+
+public class RemoveDuplicatesFromSortedList83 {
+
+public class ListNode {
+int val;
+ListNode next;
+
+ListNode() {
+}
+
+ListNode(int val) {
+this.val = val;
+}
+
+ListNode(int val, ListNode next) {
+this.val = val;
+this.next = next;
+}
+}
+
+public ListNode deleteDuplicates(ListNode head) {
+
+if (head == null || head.next == null)
+return head;
+
+ListNode recursionHead = deleteDuplicates(head.next);
+
+if (head.val == recursionHead.val)
+return recursionHead;
+else {
+head.next = recursionHead;
+return head;
+}
+}
+
+public ListNode deleteDuplicatesIterative(ListNode head) {
+
+if (head == null || head.next == null)
+return head;
+
+ListNode temp = head;
+
+while (temp != null) {
+
+if (temp.next != null && temp.val == temp.next.val) {
+
+ListNode nodeToBeDeleted = temp.next;
+temp.next = nodeToBeDeleted.next;
+
+} else {
+temp = temp.next;
+}
+}
+
+return head;
+}
+}