83. 删除排序链表中的重复元素 @Python @Go

原题

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

思路

指针

复杂度

时间：O(n)
空间：O(n)

Python代码

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def deleteDuplicates(self, head: Optional[ListNode]) -> Optional[ListNode]:
        if not head:
            return head 
        cur = head 
        while cur.next:
            if cur.val == cur.next.val:
                cur.next = cur.next.next
            else:
                cur = cur.next 
        return head
        

Go代码

/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func deleteDuplicates(head *ListNode) *ListNode {
	if head == nil {
		return head
	}
	cur := head
	for cur.Next != nil {
		if cur.Val == cur.Next.Val {
			cur.Next = cur.Next.Next
		} else {
			cur = cur.Next
		}
	}
	return head
}