1.
Explain why Stack is a recursive data structure
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Data Structures interview questions.
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- 2.
Define Stack
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- 3.
What is Queue?
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- 4.
Name some characteristics of Array Data Structure
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- 5.
Define Linked List
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- 6.
Define Tree Data Structure
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- 7.
What is Priority Queue?
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- 8.
What is Heap?
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- 9.
What is Hash Table?
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- 10.
What is String in Data Structures?
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- 11.
Define Binary Tree
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- 12.
What is a Graph?
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- 13.
What is Trie?
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- 14.
What is Complexity Analysis of Queue operations?
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- 15.
Name some disadvantages of Linked Lists?
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- 16.
What are some types of Queue?
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- 17.
Why and when should I use Stack or Queue data structures instead of Arrays/Lists?
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- 18.
What are Dynamic Arrays?
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- 19.
What are some types of Linked List?
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- 20.
What is the space complexity of a Hash Table?
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- 21.
What is Binary Heap?
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- 22.
What's the difference between the data structure Tree and Graph?
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- 23.
What is Binary Search Tree?
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- 24.
Under what circumstances are Linked Lists useful?
Answer:
- 25.
What is the difference between Strings vs. Char arrays?
Answer:
- 26.
Return the N-th value of the Fibonacci sequence Recursively
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- 27.
Return the N-th value of the Fibonacci sequence. Solve in O(n) time
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- 28.
How to implement a Tree data-structure? Provide some code.
Answer:
- 29.
Convert a Singly Linked List to Circular Linked List
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- 30.
Implement Pre-order Traversal of Binary Tree using Recursion
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- 31.
What does Sparse Array mean?
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- 32.
What is an Associative Array?
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- 33.
Compare Heaps vs Arrays to implement Priority Queue
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- 34.
What is complexity of Hash Table?
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- 35.
Name some common types and categories of Graphs
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- 36.
Name some application of Trie data structure
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- 37.
What is Balanced Tree and why is that important?
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- 38.
What is AVL Tree?
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- 39.
Explain how Heap Sort works
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- 40.
LIS: Find length of the longest increasing subsequence (LIS) in the array. Solve using DP.
Answer:
- 41.
How to merge two sorted Arrays into a Sorted Array?
Answer:
- 42.
How to check if two Strings (words) are Anagrams?
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- 43.
Convert a Binary Tree to a Doubly Linked List
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- 44.
Find all the Permutations of a String
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- 45.
Can you do Iterative Pre-order Traversal of a Binary Tree without Recursion?
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- 46.
What is Red-Black tree?
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- 47.
What are some main advantages of Tries over Hash Tables
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- 48.
How would you traverse a Linked List in O(n1/2)?
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- 49.
What is Bipartite Graph? How to detect one?
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- 50.
What are Pascal Strings?
Answer:
- 51.
Explain what is B-Tree?
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- 52.
How To Choose Between a Hash Table and a Trie (Prefix Tree)?
Answer:
- 53.
When is doubly linked list more efficient than singly linked list?
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- 54.
What is Rope Data Structure is used for?
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- 55.
Binet's formula: How to calculate Fibonacci numbers without Recursion or Iteration?
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- 56.
Explain how QuickSort works
Answer:
- 57.
Explain what is Fibonacci Search technique?
Answer:
- 58.
How to implement 3 Stacks with one Array?
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- 59.
Find the length of a Linked List which contains Cycle (Loop)
Answer:
- 60.
Compare lookup operation in Trie vs Hash Table
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- 61.
How are B-Trees used in practice?
Answer:
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