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83. Remove Duplicates from Sorted List
Given a sorted linked list, delete all duplicates such that each element appear only once.
Example 1:
Input: 1->1->2 Output: 1->2
Example 2:
Input: 1->1->2->3->3 Output: 1->2->3
附加题
如果效仿 80. Remove Duplicates from Sorted Array II 要求每个元素保留不得两个，又该怎么做呢？
Given a sorted linked list, delete all duplicates such that each element appear only once.
Example 1:
Input: 1->1->2 Output: 1->2
Example 2:
Input: 1->1->2->3->3 Output: 1->2->3
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/**
* Runtime: 1 ms, faster than 22.08% of Java online submissions for Remove Duplicates from Sorted List.
* Memory Usage: 40 MB, less than 7.14% of Java online submissions for Remove Duplicates from Sorted List.
*/
public ListNode deleteDuplicates(ListNode head) {
ListNode current = head.next;
while (Objects.nonNull(current) && Objects.nonNull(current.next)) {
if (current.val == current.next.val) {
current.next = current.next.next;
} else {
current = current.next;
}
}
return head;
}