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Linked Lists

Linked Lists are one of the most fundamental Computer Science data structures.

Singly-Linked List

In a singly-linked list you have a head, the start of the list, and nodes which hold the data. Each node holds a single element of data and a link to the next node in the list.

Using sweet ASCII art, it might look like this:

HEAD ---> ["hello" | -]--> ["world" | -]--> ["!" | ]

The three nodes here hold the data "hello", "world", and "!". The first two node have links which point to other nodes. The last node, holding the data "!", has no reference in the link spot. This signifies that it is the end of the list.


A fully functional singly linked list can:

  • Insert elements
  • Pop an element from the end
  • Push an element onto the beginning
  • Remove the (first occurance | all occurances) of an element by data content
  • Remove an element by position
  • Add an element at an arbitrary position
  • Add an element after a known node
  • Find whether a data element is or is not in the list
  • Find the distance between two nodes


Implement a singly-linked list using:

  • A) Iteration/looping
  • B) Recursion

Doubly-Linked List

In a doubly-linked list, each node has a link to both the previous and next nodes in the list.


A doubly-linked list implements all the functionality of a singly-linked list and also:

  • Insert a node immediately before a known node
  • Find the shortest distance between two nodes

Ring List

In a circular or ring list, the "last" node links back to the first. How does this structure affect searching?

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