83_Remove Duplicates from Sorted List

/*
83_Remove Duplicates from Sorted List
Runtime: 0 ms, faster than 100.00% of Java online submissions for Remove Duplicates from Sorted List.
Memory Usage: 39.1 MB, less than 67.06% of Java online submissions for Remove Duplicates from Sorted List.

 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
    if(head==null)
        return null;
    ListNode temp= head;    
    while(head!=null)
    {   ListNode prev=head;
      
          while(head.next!=null && head.val==head.next.val)
              head=head.next;
      prev.next=head.next;
     head=head.next;
        
    }
    
    return temp;
    }
}