83. Remove Duplicates from Sorted List

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

Python

class Solution:
    def deleteDuplicates(self, head: Optional[ListNode]) -> Optional[ListNode]:
        if not head:
            return head

        pre = head
        cur = head.next

        while cur:
            if cur.val == pre.val:
                pre.next = cur.next
            else:
                pre = cur
            cur = cur.next
        return head

Go

func deleteDuplicates(head *ListNode) *ListNode {
    if head == nil {
        return head
    }

    pre := head
    cur := head.Next
    for cur != nil {
        if pre.Val == cur.Val {

            pre.Next = cur.Next
        } else {
            pre = cur
        }
        cur = cur.Next
    }
    return head
}