DCA - TCS Digital Interview Questions 2025

DCA Interview

1. What is a data structure?
2. What is the difference between an array and a linked list?
3. Explain the concept of time complexity.
4. What is a stack and how is it implemented?
5. What is a queue and how is it implemented?
6. Explain the concept of recursion.
7. What is a binary tree and how is it traversed?
8. Explain the difference between a binary search tree and a balanced binary search tree.
9. What is a hash table and how does it work?
10. What is the difference between a hash table and a binary search tree?
11. Explain the concept of dynamic programming.
12. What is the difference between breadth-first search and depth-first search?
13. What is a graph and how is it represented?
14. What is Dijkstra's algorithm and how does it work?
15. What is the difference between a greedy algorithm and a dynamic programming algorithm?
16. Explain the concept of memoization.
17. What is the difference between an AVL tree and a red-black tree?
18. Explain the concept of a priority queue.
19. What is the difference between a heap and a binary search tree?
20. Explain the concept of a trie.
21. What is the difference between a stack and a queue?
22. What is an adjacency matrix and how is it used in graph theory?
23. What is the difference between an adjacency matrix and an adjacency list?
24. Explain the concept of an algorithm.
25. What is the difference between an algorithm and a program?
26. Explain the concept of a tree.
27. What is a binary search and how does it work?
28. What is the difference between a hash table and a dictionary?
29. Explain the concept of a linked list.
30. What is the difference between a singly linked list and a doubly linked list?