https://leetcode.com/problems/remove-duplicates-from-sorted-list/

 

public ListNode deleteDuplicates(ListNode head) {        int last = -1;        ListNode store = null;        ListNode cur = head;        while (cur != null) {            if (store == null) {                store = head;            }            else if (cur.val != last) {                store = store.next;                store.val = cur.val;            }            last = cur.val;            cur = cur.next;        }        if (store != null) {            store.next = null;        }        return head;    }