Create 83. Remove Duplicates from Sorted List.java

Author: SharmaTushar1

java/83. Remove Duplicates from Sorted List.java

@@ -0,0 +1,20 @@
+//Three pointer approach that we use in in-place reversal of linked list.
+
+class Solution {
+    public ListNode deleteDuplicates(ListNode head) {
+        ListNode p = null;
+        ListNode q = null;
+        ListNode r = head;
+        while (r!=null) {
+            if (q!=null && q.val == r.val) {
+                r = r.next;
+                q.next = r;
+            }else {
+                p = q;
+                q = r;
+                r = r.next;
+            }
+        }
+        return head;
+    }
+}