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Data Structures – GeeksforGeeks

Data Structures – GeeksforGeeks

A data structure is a particular way of organizing data in a computer so that it can be used effectively.

For example, we can store a list of items having the same data-type using the array data structure.

Array Data Structure

This page contains detailed tutorials on different data structures with topic-wise problems.



Linked List:

Singly Linked List:

  1. Introduction to Linked List
  2. Linked List vs Array
  3. Linked List Insertion
  4. Linked List Deletion (Deleting a given key)
  5. Linked List Deletion (Deleting a key at given position)
  6. A Programmer’s approach of looking at Array vs. Linked List
  7. Find Length of a Linked List (Iterative and Recursive)
  8. How to write C functions that modify head pointer of a Linked List?
  9. Swap nodes in a linked list without swapping data
  10. Reverse a linked list
  11. Merge two sorted linked lists
  12. Merge Sort for Linked Lists
  13. Reverse a Linked List in groups of given size
  14. Detect and Remove Loop in a Linked List
  15. Add two numbers represented by linked lists | Set 1
  16. Rotate a Linked List
  17. Generic Linked List in C

Circular Linked List:

  1. Circular Linked List Introduction and Applications,
  2. Circular Singly Linked List Insertion<
  3. Circular Linked List Traversal
  4. Split a Circular Linked List into two halves
  5. Sorted insert for circular linked list

Doubly Linked List:

  1. Doubly Linked List Introduction and Insertion
  2. Delete a node in a Doubly Linked List
  3. Reverse a Doubly Linked List
  4. The Great Tree-List Recursion Problem.
  5. QuickSort on Doubly Linked List
  6. Merge Sort for Doubly Linked List

All Articles of Linked List

Quiz on Linked ListCoding Practice on Linked ListRecent Articles on Linked List


  1. Introduction to Stack
  2. Infix to Postfix Conversion using Stack
  3. Evaluation of Postfix Expression
  4. Reverse a String using Stack
  5. Implement two stacks in an array
  6. Check for balanced parentheses in an expression
  7. Next Greater Element
  8. Reverse a stack using recursion
  9. Sort a stack using recursion
  10. The Stock Span Problem
  11. Design and Implement Special Stack Data Structure
  12. Implement Stack using Queues
  13. Design a stack with operations on middle element
  14. How to efficiently implement k stacks in a single array?
  15. Sort a stack using recursion

Quiz on Stack

All Articles on StackCoding Practice on StackRecent Articles on Stack


  1. Queue Introduction and Array Implementation
  2. Linked List Implementation of Queue
  3. Applications of Queue Data Structure
  4. Priority Queue Introduction
  5. Deque (Introduction and Applications)
  6. Implementation of Deque using circular array
  7. Implement Queue using Stacks
  8. Find the first circular tour that visits all petrol pumps
  9. Maximum of all subarrays of size k
  10. An Interesting Method to Generate Binary Numbers from 1 to n
  11. How to efficiently implement k Queues in a single array?

Quiz on Queue

All Articles on QueueCoding Practice on QueueRecent Articles on Queue

Binary Tree:

  1. Binary Tree Introduction
  2. Binary Tree Properties
  3. Types of Binary Tree
  4. Handshaking Lemma and Interesting Tree Properties
  5. Enumeration of Binary Tree
  6. Applications of tree data structure
  7. Tree Traversals
  8. BFS vs DFS for Binary Tree
  9. Level Order Tree Traversal
  10. Diameter of a Binary Tree
  11. Inorder Tree Traversal without Recursion
  12. Inorder Tree Traversal without recursion and without stack!
  13. Threaded Binary Tree
  14. Maximum Depth or Height of a Tree
  15. If you are given two traversal sequences, can you construct the binary tree?
  16. Clone a Binary Tree with Random Pointers
  17. Construct Tree from given Inorder and Preorder traversals
  18. Maximum width of a binary tree
  19. Print nodes at k distance from root
  20. Print Ancestors of a given node in Binary Tree
  21. Check if a binary tree is subtree of another binary tree
  22. Connect nodes at same level

Quiz on Binary Tree

Quiz on Binary Tree TraversalsAll articles on Binary TreeCoding Practice on Binary TreeRecent Articles on Tree

Binary Search Tree:

  1. Search and Insert in BST
  2. Deletion from BST
  3. Minimum value in a Binary Search Tree
  4. Inorder predecessor and successor for a given key in BST
  5. Check if a binary tree is BST or not
  6. Lowest Common Ancestor in a Binary Search Tree.
  7. Inorder Successor in Binary Search Tree
  8. Find k-th smallest element in BST (Order Statistics in BST)
  9. Merge two BSTs with limited extra space
  10. Two nodes of a BST are swapped, correct the BST
  11. Floor and Ceil from a BST
  12. In-place conversion of Sorted DLL to Balanced BST
  13. Find a pair with given sum in a Balanced BST
  14. Total number of possible Binary Search Trees with n keys
  15. Merge Two Balanced Binary Search Trees
  16. Binary Tree to Binary Search Tree Conversion

Quiz on Binary Search Trees

Quiz on Balanced Binary Search TreesAll Articles on Binary Search TreeCoding Practice on Binary Search TreeRecent Articles on BST


  1. Binary Heap
  2. Why is Binary Heap Preferred over BST for Priority Queue?
  3. Binomial Heap
  4. Fibonacci Heap
  5. Heap Sort
  6. K’th Largest Element in an array
  7. Sort an almost sorted array/
  8. Tournament Tree (Winner Tree) and Binary Heap

All Articles on Heap

Quiz on HeapCoding Practice on HeapRecent Articles on Heap


  1. Hashing Introduction
  2. Separate Chaining for Collision Handling
  3. Open Addressing for Collision Handling
  4. Print a Binary Tree in Vertical Order
  5. Find whether an array is subset of another array
  6. Union and Intersection of two Linked Lists
  7. Find a pair with given sum
  8. Check if a given array contains duplicate elements within k distance from each other
  9. Find Itinerary from a given list of tickets
  10. Find number of Employees Under every Employee

Quiz on Hashing

All Articles on HashingCoding Practice on HashingRecent Articles on Hashing


Introduction, DFS and BFS:

  1. Graph and its representations
  2. Breadth First Traversal for a Graph
  3. Depth First Traversal for a Graph
  4. Applications of Depth First Search
  5. Applications of Breadth First Traversal
  6. Detect Cycle in a Directed Graph
  7. Detect Cycle in a an Undirected Graph
  8. Detect cycle in an undirected graph
  9. Longest Path in a Directed Acyclic Graph
  10. Topological Sorting
  11. Check whether a given graph is Bipartite or not
  12. Snake and Ladder Problem
  13. Minimize Cash Flow among a given set of friends who have borrowed money from each other
  14. Boggle (Find all possible words in a board of characters)
  15. Assign directions to edges so that the directed graph remains acyclic

All Articles on Graph Data Structure

Quiz on GraphQuiz on Graph TraversalsQuiz on Graph Shortest PathsQuiz on Graph Minimum Spanning TreeCoding Practice on GraphRecent Articles on Graph

Advanced Data Structure:

Advanced Lists:

  1. Memory efficient doubly linked list
  2. XOR Linked List – A Memory Efficient Doubly Linked List | Set 1
  3. XOR Linked List – A Memory Efficient Doubly Linked List | Set 2
  4. Skip List | Set 1 (Introduction)
  5. Self Organizing List | Set 1 (Introduction)
  6. Unrolled Linked List | Set 1 (Introduction)

Segment Tree:

  1. Segment Tree | Set 1 (Sum of given range)
  2. Segment Tree | Set 2 (Range Minimum Query)
  3. Lazy Propagation in Segment Tree
  4. Persistent Segment Tree | Set 1 (Introduction)

All articles on Segment Tree

  1. Trie | (Insert and Search)
  2. Trie | (Delete)
  3. Longest prefix matching – A Trie based solution in Java
  4. Print unique rows in a given boolean matrix
  5. How to Implement Reverse DNS Look Up Cache?
  6. How to Implement Forward DNS Look Up Cache?

All Articles on Trie
Binary Indexed Tree:

  1. Binary Indexed Tree
  2. Two Dimensional Binary Indexed Tree or Fenwick Tree
  3. Binary Indexed Tree : Range Updates and Point Queries
  4. Binary Indexed Tree : Range Update and Range Queries

All Articles on Binary Indexed Tree
Suffix Array and Suffix Tree:

  1. Suffix Array Introduction
  2. Suffix Array nLogn Algorithm
  3. kasai’s Algorithm for Construction of LCP array from Suffix Array
  4. Suffix Tree Introduction
  5. Ukkonen’s Suffix Tree Construction – Part 1
  6. Ukkonen’s Suffix Tree Construction – Part 2
  7. Ukkonen’s Suffix Tree Construction – Part 3
  8. Ukkonen’s Suffix Tree Construction – Part 4,
  9. Ukkonen’s Suffix Tree Construction – Part 5
  10. Ukkonen’s Suffix Tree Construction – Part 6
  11. Generalized Suffix Tree
  12. Build Linear Time Suffix Array using Suffix Tree
  13. Substring Check
  14. Searching All Patterns
  15. Longest Repeated Substring,
  16. Longest Common Substring, Longest Palindromic Substring

All Articles on Suffix Tree
AVL Tree:

  1. AVL Tree | Set 1 (Insertion)
  2. AVL Tree | Set 2 (Deletion)
  3. AVL with duplicate keys

Splay Tree:

  1. Splay Tree | Set 1 (Search)
  2. Splay Tree | Set 2 (Insert)

B Tree:

  1. B-Tree | Set 1 (Introduction)
  2. B-Tree | Set 2 (Insert)
  3. B-Tree | Set 3 (Delete)

Red-Black Tree:

  1. Red-Black Tree Introduction
  2. Red Black Tree Insertion.
  3. Red-Black Tree Deletion
  4. Program for Red Black Tree Insertion

All Articles on Self-Balancing BSTs

K Dimensional Tree:

  1. KD Tree (Search and Insert)
  2. K D Tree (Find Minimum)
  3. K D Tree (Delete)


  1. Treap (A Randomized Binary Search Tree)
  2. Ternary Search Tree
  3. Interval Tree
  4. Implement LRU Cache
  5. Sort numbers stored on different machines
  6. Find the k most frequent words from a file
  7. Given a sequence of words, print all anagrams together
  8. Tournament Tree (Winner Tree) and Binary Heap
  9. Decision Trees – Fake (Counterfeit) Coin Puzzle (12 Coin Puzzle)
  10. Spaghetti Stack
  11. Data Structure for Dictionary and Spell Checker?
  12. Cartesian Tree
  13. Cartesian Tree Sorting
  14. Sparse Set
  15. Centroid Decomposition of Tree
  16. Gomory-Hu Tree

Recent Articles on Advanced Data Structures.


  1. Search, insert and delete in an unsorted array
  2. Search, insert and delete in a sorted array
  3. Write a program to reverse an array
  4. Leaders in an array
  5. Given an array A[] and a number x, check for pair in A[] with sum as x
  6. Majority Element
  7. Find the Number Occurring Odd Number of Times
  8. Largest Sum Contiguous Subarray
  9. Find the Missing Number
  10. Search an element in a sorted and pivoted array
  11. Merge an array of size n into another array of size m+n
  12. Median of two sorted arrays
  13. Program for array rotation
  14. Reversal algorithm for array rotation
  15. Block swap algorithm for array rotation
  16. Maximum sum such that no two elements are adjacent
  17. Sort elements by frequency | Set 1
  18. Count Inversions in an array

All Articles on Array

Coding Practice on ArrayQuiz on ArrayCoding Practice on ArrayRecent Articles on Array


  1. Search in a row wise and column wise sorted matrix
  2. Print a given matrix in spiral form
  3. A Boolean Matrix Question
  4. Print unique rows in a given boolean matrix
  5. Maximum size square sub-matrix with all 1s
  6. Print unique rows in a given boolean matrix
  7. Inplace M x N size matrix transpose | Updated
  8. Dynamic Programming | Set 27 (Maximum sum rectangle in a 2D matrix)
  9. Strassen’s Matrix Multiplication
  10. Create a matrix with alternating rectangles of O and X
  11. Print all elements in sorted order from row and column wise sorted matrix
  12. Given an n x n square matrix, find sum of all sub-squares of size k x k
  13. Count number of islands where every island is row-wise and column-wise separated
  14. Find a common element in all rows of a given row-wise sorted matrix

All Articles on Matrix

Coding Practice on MatrixRecent Articles on Matrix.


  1. Commonly Asked Data Structure Interview Questions | Set 1
  2. A data structure for n elements and O(1) operations
  3. Expression Tree

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