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Leetcode #83: Remove Duplicates from Sorted List

leetcode

Posted at 2019-05-05

func deleteDuplicates(_ head: ListNode?) -> ListNode? {
    var pre = head
    var next = pre?.next
    while next != nil {
        if pre!.val == next!.val {
            pre?.next = next?.next
            next = pre?.next
        } else {
            pre = next
            next = next?.next
        }
    }
    return head
}

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