LeetCode83----删除排序链表中的重复元素

Posted 2020-11-17 book808

给定一个排序链表，删除所有重复的元素，使得每个元素只出现一次。

示例 1:

输入: 1->1->2
输出: 1->2

示例 2:

输入: 1->1->2->3->3
输出: 1->2->3

代码如下：

public class LeetCode83 {
	public static class ListNode {
		int val;
		ListNode next;

		ListNode(int x) {
			val = x;
		}
	}

	public ListNode deleteDuplicates(ListNode head) {
		if (head == null || head.next == null) {
			return head;
		}
		ListNode prev = head;
		ListNode cur = head.next;
		while (cur != null) {
			if (prev.val == cur.val) {
				prev.next = cur.next;
			} else {
				prev = prev.next;
				cur = cur.next;
			}
		}
		return head;
	}
}