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Top 22 Big-O Notation Interview Questions  Big-O Notation  22  
Top 62 Data Structures Interview Questions  Data Structures  62  
Top 29 Databases Interview Questions  Databases  29  
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Top 59 MATLAB Interview Questions  MATLAB  59  
Top 40 NumPy Interview Questions  NumPy  40  
Top 68 Pandas Interview Questions  Pandas  68  
Top 139 Python Interview Questions  Python  139  
Top 41 R Interview Questions  R  41  
Top 52 SQL Interview Questions  SQL  52  
Top 39 Scala Interview Questions  Scala  39  
Top 24 Searching Interview Questions  Searching  24  
Top 26 Sorting Interview Questions  Sorting  26  
👨‍💻 Having Full-Stack & Coding Interview? Check  FullStack.Cafe - 3877 Full-Stack, Coding & System Design Questions and AnswersHaving Full-Stack & Coding Interview? Check 👨‍💻 FullStack.Cafe - 3877 Full-Stack, Coding & System Design Questions and Answers

Top 62 Data Structures Interview Questions

Entry Junior Mid Senior Expert
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Data Structures Theoretical Questions
Q1:   

Define Binary Tree

  Related To: Binary Tree, Trees
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Q2:   

What is Priority Queue?

  Related To: Heaps and Maps
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Q3:   

Define Tree Data Structure

  Related To: Trees
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Q4:   

What is Hash Table?

  Related To: Hash Tables
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Q5:   

What is a Graph?

  Related To: Graph Theory
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Q6:   

What is Heap?

  Related To: Heaps and Maps
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Q7:   

What is Queue?

  Related To: Queues
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Q8:   

Name some characteristics of Array Data Structure

  Related To: Arrays
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Q9:   

What is String in Data Structures?

  Related To: Strings
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Q10:   

Define Linked List

  Related To: Linked Lists
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Q11:   

What is Trie?

  Related To: Trie
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Q12:   

Explain why Stack is a recursive data structure

  Related To: Stacks
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Q13:   

Define Stack

  Related To: Stacks
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Q14:   

What is the difference between Strings vs. Char arrays?

  Related To: Strings
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Q15:   

What is Binary Search Tree?

  Related To: Binary Tree, Trees
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Q16:   

Under what circumstances are Linked Lists useful?

  Related To: Linked Lists
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Q17:   

What's the difference between the data structure Tree and Graph?

  Related To: Graph Theory, Trees
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Q18:   

What is Binary Heap?

  Related To: Heaps and Maps, Binary Tree
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Q19:   

Why and when should I use Stack or Queue data structures instead of Arrays/Lists?

  Related To: Queues, Stacks
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Q20:   

What is the space complexity of a Hash Table?

  Related To: Hash Tables
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Q21:   

What is Complexity Analysis of Queue operations?

  Related To: Queues
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Q22:   

What are some types of Queue?

  Related To: Queues
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Q23:   

What are some types of Linked List?

  Related To: Linked Lists
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Q24:   

Name some disadvantages of Linked Lists?

  Related To: Linked Lists
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Q25:   

What are Dynamic Arrays?

  Related To: Arrays
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Q26:   

Name some application of Trie data structure

  Related To: Trie
 Add to PDF   Mid 
Q27:   

What does Sparse Array mean?

  Related To: Arrays
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Q28:   

What is AVL Tree?

  Related To: Binary Tree, Trees
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Q29:   

What is Balanced Tree and why is that important?

  Related To: Binary Tree, Trees
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Q30:   

Name some common types and categories of Graphs

  Related To: Graph Theory
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Q31:   

What is an Associative Array?

  Related To: Arrays
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Q32:   

What is complexity of Hash Table?

  Related To: Hash Tables
 Add to PDF   Mid 
Q33:   

Compare Heaps vs Arrays to implement Priority Queue

  Related To: Heaps and Maps
 Add to PDF   Mid 
Q34:   

What is Bipartite Graph? How to detect one?

  Related To: Graph Theory
 Add to PDF   Senior 
Q35:   

Explain what is B-Tree?

  Related To: Trees
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Q36:   

What is Rope Data Structure is used for?

  Related To: Strings
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Q37:   

What is the Hughes Phenomenon?

  Related To: Dimensionality Reduction
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Q38:   

How To Choose Between a Hash Table and a Trie (Prefix Tree)?

  Related To: Hash Tables, Trie
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Q39:   

What is Red-Black tree?

  Related To: Binary Tree, Trees
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Q40:   

When is doubly linked list more efficient than singly linked list?

  Related To: Linked Lists
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Q41:   

What are Pascal Strings?

  Related To: Strings
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Q42:   

How would you traverse a Linked List in O(n1/2)?

  Related To: Linked Lists
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Q43:   

What are some main advantages of Tries over Hash Tables

  Related To: Hash Tables, Trie
 Add to PDF   Senior 
Q44:   

How are B-Trees used in practice?

  Related To: Trees
 Add to PDF   Expert 
Q45:   

Compare lookup operation in Trie vs Hash Table

  Related To: Hash Tables, Trie
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Data Structures Practical Challenges
Q1:   

Convert a Singly Linked List to Circular Linked List

 PY Related To: Linked Lists, Python
 Add to PDF   Junior 
Q2:   

How to implement a Tree data-structure? Provide some code.

 JavaPY Related To: Binary Tree, Trees, Python
 Add to PDF   Junior 
Q3:   

Implement Pre-order Traversal of Binary Tree using Recursion

 JavaPY Related To: Binary Tree, Python
 Add to PDF   Junior 
Q4:   

Return the N-th value of the Fibonacci sequence Recursively

 JSJavaPY Related To: Fibonacci Series, Python
 Add to PDF   Junior 
Q5:   

Return the N-th value of the Fibonacci sequence. Solve in O(n) time

 JSJavaPY Related To: Fibonacci Series, Python
 Add to PDF   Junior 
Q6:   

LIS: Find length of the longest increasing subsequence (LIS) in the array. Solve using DP.

 JSJavaPY Related To: Dynamic Programming, Python
  Add to PDF   Mid 
Q7:   

Find all the Permutations of a String

 JSJavaPY Related To: Backtracking, Strings, Python
  Add to PDF   Mid 
Q8:   

How to check if two Strings (words) are Anagrams?

 CSJavaPY Related To: Strings, Python
  Add to PDF   Mid 
Q9:   

Convert a Binary Tree to a Doubly Linked List

 JavaPY Related To: Binary Tree, Divide & Conquer, Linked Lists, Recursion, Python
  Add to PDF   Mid 
Q10:   

How to merge two sorted Arrays into a Sorted Array?

 JSJavaPY Related To: Arrays, Python
  Add to PDF   Mid 
Q11:   

Explain how Heap Sort works

 JSPY Related To: Heaps and Maps, Sorting, Python
  Add to PDF   Mid 
Q12:   

Can you do Iterative Pre-order Traversal of a Binary Tree without Recursion?

 CSPY Related To: Binary Tree, Python
  Add to PDF   Mid 
Q13:   

Find the length of a Linked List which contains Cycle (Loop)

 JavaPY Related To: Linked Lists, Python
  Add to PDF   Senior 
Q14:   

How to implement 3 Stacks with one Array?

  Related To: Arrays, Stacks
  Add to PDF   Senior 
Q15:   

Explain what is Fibonacci Search technique?

 CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Python
  Add to PDF   Senior 
Q16:   

Binet's formula: How to calculate Fibonacci numbers without Recursion or Iteration?

 CSJSJavaPY Related To: Fibonacci Series, Python
  Add to PDF   Senior 
Q17:   

Explain how QuickSort works

 JSPY Related To: Divide & Conquer, Sorting, Python
  Add to PDF   Senior 
 
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