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  1. Prepare
  2. Data Structures
  3. Linked Lists
  4. Insert a node at a specific position in a linked list
  5. Discussions

Insert a node at a specific position in a linked list

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1530 Discussions

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  • alban_tyrex
     + 0 comments

    Here is my C++ solution, you can watch the explanation here : https://youtu.be/jCPAp_UIzAs

    SinglyLinkedListNode* insertNodeAtPosition(SinglyLinkedListNode* llist, int data, int position) {
    SinglyLinkedListNode* newNode = new SinglyLinkedListNode(data);
    if(position == 0) {
        newNode->next = llist;
        return newNode;
    }
    SinglyLinkedListNode* curr = llist;
    while(position - 1) {
        position--;
        curr = curr -> next;
    }
    newNode -> next = curr->next;
    curr->next = newNode;
    return llist;
}

  • somaditya
     + 0 comments

    simplest python solution:

    def insertNodeAtPosition(llist, data, position):
    new_node = SinglyLinkedListNode(data)
    curr = llist
    prev = llist
        
    for i in range(position):
        prev = curr
        curr = curr.next
        
    prev.next = new_node
    new_node.next = curr
    
    return llist

  • tobypong
     + 0 comments

    Is the problem statement wrong? The head pointer can't be null because n >= 1. Am I right?

  • xof1986
     + 0 comments

    For C# csharp you cannot compile as given.

    class Result
{
    public static SinglyLinkedListNode insertNodeAtPosition(...)
    {
		...
    }
}

    You need to modify the above code by removing class Result{} block and remove the public modifer on the method.

    You should be left with...

        static SinglyLinkedListNode insertNodeAtPosition(...)
    {
		...
    }

    This should allow your code to compile.

  • liazhur
     + 0 comments

    Hackerrank fix your code in provided Solution for c#, throws error