Solve the problems to Revise all the topics done so far.
A Linked List is a linear data structure made of nodes. Each node stores data and a link to another node.
A node contains the data and the link needed to connect it to another node.
Nodes are connected using links, forming a sequence.
Nodes can be added or removed without requiring a continuous block of memory.
Each node stores a value and a link to the next node. The first node is reached through the head.
The value stored inside the node.
The link that points to the next node.
A pointer or reference used to access the first node.
The final node points to NULL, indicating the end of the list.
Each node points only to the next node.
Each node contains links to both the previous and next nodes.
The last node links back to the first node instead of pointing to NULL.
Most Linked List problems are built around a few fundamental operations.
Visit nodes one by one from the head.
Add a new node at a required position.
Remove a node by changing the required links.
Traverse the list to find a required value.
To insert a node, connect the new node to the correct part of the list and update the surrounding link.
Deletion usually means changing a link so that the unwanted node is skipped.
| Operation | Singly Linked List | Reason |
|---|---|---|
| Access by index | O(n) | Nodes must be traversed |
| Search | O(n) | May need to visit every node |
| Insert at head | O(1) | Only head needs updating |
| Delete at head | O(1) | Move head to the next node |
| Traverse | O(n) | Visit each node |
Useful when elements are frequently inserted and removed.
Linked Lists can be used to implement these data structures.
Linked structures are useful in systems where flexible allocation is needed.
Linked structures can help represent adjacency relationships.
Reverse the direction of the links.
Use the slow and fast pointer technique.
Use two pointers moving at different speeds.
Combine two sorted Linked Lists.
Use two pointers to locate the required node.
Check whether the list reads the same forward and backward.
Learn Linked List concepts through visual explanations.
Understand nodes, links and the head.
Learn how links change during updates.
Practice common interview patterns.
Practice common interview patterns.
Practice common interview patterns..
Practice common interview patterns.
Practice common interview patterns.