83. Remove Duplicates from Sorted List
Given a sorted linked list, delete all duplicates such that each element appear only once.
For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.
//和203有所不同，203第一个节点也可能被remove所以要借助dummy。这个题不需要dummy
public class Solution {
public ListNode deleteDuplicates(ListNode head) {
ListNode list = head;
if (head == null || head.next == null) {
return head;
}
while (head != null && head.next != null){
if (head.val == head.next.val) {
head.next = head.next.next;
} else {
head = head.next;
}
}
return list;
}
}
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