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Linked-List

Using object oriented design constructs, define a Node class and LinkedList class for a singly linked list. Each node has integer data value and a link to the next node. The linked list class has a head node and the following methods defined.

Getting Started

As usual with a python project, create a virtual environment:

python3 -m venv venv

Then activate the virtual environment

source venv/bin/activate

Then install the required packages.

pip install -r requirements.txt

Exercise

Design and implement the classes and the methods. Implement the methods within the Linked List class that are currently only contain pass.

Complete the following methods:

  • get_first - This method returns the value of the 1st node in the list (head). It returns None if the list is empty.
  • add_first - This method adds a new node with the given value to the head of the list.
  • search - This method returns True or False if the list contains the given value.
  • length - This method returns the size of the list.
  • get_at_index - This method returns the value of the node at the given index. It returns None if the list does not have that many elements.
  • get_last - This method returns the value of the last node in the list.
  • add_last - This method adds a new node to the rear of the list.
  • find_max - This method finds the largest value in the list, assuming you can use >, or < to compare each element in the list.
  • delete - This method deletes the node at the given index maintaining all the remaining elements in the same order.
  • reverse - This method reverses the list.

Going Further

There are a set of advanced methods you can choose to implement for additional practice. Tests are provided, but you will need to unskip them by removing the @pytest.mark.skip decorator.

For more practice complete the following methods:

  • find_middle_value - This method returns the value in the middle of the list (rounded down for even length lists).
  • find_nth_from_n - This method returns the value of the node which is nth from last in the list.
  • has_cycle- This method returns true if there is a loop in the list. I.e. somehow a node's next value is pointing to a prior node.