3 line recursive solution


  • 254
    R
    public ListNode removeElements(ListNode head, int val) {
            if (head == null) return null;
            head.next = removeElements(head.next, val);
            return head.val == val ? head.next : head;
    }

  • 1
    G

    nice solution without using dummy.


  • -35
    L
    This post is deleted!

  • 0
    A

    Very clean, an eloquent.bravo!!


  • 0
    C

    beautiful !!!!!! i find the lovely of java


  • 15
    C

    But the recursion will be too deep and may not pass the test. At least it is true when I implement this method with python


  • 0

    Your comment is cleaner.


  • 19

    I think this recursion is more intuitive:

    public ListNode removeElements(ListNode head, int val) {
        if(head == null) return null;
        ListNode next = removeElements(head.next, val);
        if(head.val == val) return next;
        head.next = next;
        return head;
    }

  • 0
    L

    Someone else used my account to leave this message................. I did not post this comment...


  • 0
    C

    Your version is easy to understand. Thank you!


  • 0

    haha, then you are so lucky! Got so many votes. :P


  • 1
    G

    @renzid Succinct Solution!
    Both top voted solutions (@renzid , @lx223 -solution ) does not set deleted/skipped node's next to null.

    A -> B -> C
    
    Deleting B without setting null to B's next result in 
    A -> C 
    B -> C
    
    Ideally this should be only
    A -> C
    

    Though this problem does not explicitly mention/verify, I think this is worth pointing this out.


  • 4
    R

    Can anyone explain it....it's hard to understand for me.....


  • 0
    W

    strong!yeah!!!


  • 0
    A

    @Ramos It basically goes down to the last null node, and rebuilds the linked list, by adding only the nodes which are not equal to val to this null, so it goes from
    null ;
    [5->null] //when head is 6 it doesnt add anything to head
    [4-->5-->null]
    [3-->4-->5-->-->null]
    [2-->3-->4-->5-->null]
    [1-->2-->3-->4-->5-->null]


  • 0

    very smart,very simple!


  • 0
    J

    @renzid I used recursive solution in this way (Python), but it warned me that "RuntimeError: maximum recursion depth exceeded in cmp". I also tried yours and got the same error. I really don't know why, can u explain that? Thanks.

    class Solution(object):
    def removeElements(self, head, val):
    """
    :type head: ListNode
    :type val: int
    :rtype: ListNode
    """
    if head==None:
    return head

        start = ListNode(0)
        start.next = head
        
        if head.val==val:
            start.next = self.removeElements(head.next, val)
        else:
            head.next = self.removeElements(head.next, val)
            
        return start.next

  • 0
    A

    It does not work for Python...why?

    class Solution(object):
        def removeElements(self, head, val):
            """
            :type head: ListNode
            :type val: int
            :rtype: ListNode
            """
            if not head:
                return None
            head.next = self.removeElements(head.next, val)
            return head.next if head.val == val else head
    
    Runtime Error Message:
    Line 16: RuntimeError: maximum recursion depth exceeded
    Last executed input:
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]
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  • 0
    W

    @Ramos 我也理解不了


  • 0
    W

    @renzid I don't understand the recurive


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