100 Data Structures and Algorithms Problems Asked During Coding Interviews
I am Amit Shekhar, Co-Founder @ Outcome School, I have taught and mentored many developers, and their efforts landed them high-paying tech jobs, helped many tech companies in solving their unique problems, and created many open-source libraries being used by top companies. I am passionate about sharing knowledge through open-source, blogs, and videos.
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Here, I have listed the 100 Data Structures and Algorithms Problems asked during the coding interviews in companies like Amazon, Microsoft, Facebook, LinkedIn, Adobe, Uber, Yahoo, eBay, etc.
Practice problems and never give up!
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Let’s get started with the questions.
- Roman To Integer
Asked in: Amazon, Microsoft, Facebook
2. Reverse Bits
Asked in: Amazon
3. Square Root of Integer
Asked in: Amazon, Microsoft, Facebook
4. Calculate power function
Asked in: Google, LinkedIn, Amazon
5. Greatest Common Divisor
Asked in: Google
6. Find the Closest Palindrome
Asked in: Microsoft, Amazon
7. Rotate matrix
Asked in: Google
8. Spiral Matrix
Asked in: Microsoft, Amazon
9. Wave Array
Asked in: Amazon, Google, Adobe
10. Set Matrix Zeroes
Asked in: Amazon, Google
11. maximum j — i such that A[j] > A[i]
Asked in: Google, Amazon, Adobe
12. Move zeroes to an end
Asked in: Facebook, Uber
13. Merge two sorted arrays
Asked in: Microsoft, Adobe
14. Container with Most Water
Asked in: Amazon, Google, Facebook, Adobe
15. Remove duplicates from sorted array
Asked in: Amazon, Microsoft, Google
16. Find an element in Bitonic array
Asked in: Amazon
17. Find minimum element in sorted and rotated array
Asked in: Facebook
18. Median of two sorted array of same size
Asked in: Amazon, Microsoft, Google
19. Inversion count in an array
Asked in: Amazon, Google
20. Search for a Range in a sorted array
Asked in: Microsoft, Google
21. Longest Common Prefix
Asked in: Amazon, Google
22. Median in row wise sorted matrix
Asked in: Amazon
23. Swap List Nodes in pairs
Asked in: Amazon, Microsoft
24. Add Two Numbers as Lists
Asked in: Amazon, Microsoft, Facebook
25. Check if a singly linked list is palindrome
Asked in: Amazon, Microsoft
26. Reverse a linked list from position m to n
Asked in: Amazon, Microsoft, Facebook
27.Detect and Remove Loop in a Linked List
Asked in: Amazon, Microsoft
28. Merge Two Sorted Lists
Asked in: Amazon, Microsoft, Yahoo
29. Remove Nth Node from List End
Asked in: Amazon
30. Sort a linked list using insertion sort
Asked in: Microsoft, Google
31. Find next greater element in an array
Asked in: Amazon, Microsoft
32. Trapping rain water
Asked in: Amazon, Google
33. Merge overlapping intervals
Asked in: Amazon, Google
34. Largest Rectangle in Histogram
Asked in: Amazon, Google, Facebook
35. Check for balanced parentheses in an expression
Asked in: Amazon, Microsoft
36. Min Stack Problem
Asked in: Amazon, Microsoft, Yahoo, Adobe
37. LRU Cache implementation
Asked in: Amazon, Microsoft, Adobe, Google
38. Sort a stack using another stack
Asked in: Amazon, Microsoft
39. Lowest Common Ancestor of a Binary tree
Asked in: Amazon, Google, Microsoft, Facebook, Adobe
40. Path sum in binary tree
Asked in: Amazon, Microsoft, Yahoo
41. Min Depth of Binary Tree
Asked in: Amazon, Facebook
42. Binary Tree Zigzag Level Order Traversal
Asked in: Amazon, Microsoft
43. Invert Binary Tree
Asked in: Amazon, Google
44. Flatten Binary Tree to Linked List
Asked in: Amazon, Microsoft, Yahoo, Adobe
45. Find diameter of binary tree
Asked in: Facebook, Google, Amazon
46. All Nodes Distance K in Binary Tree
Asked in: Microsoft
47. Merge two binary tree
Asked in: Amazon, Microsoft
48. Shortest Unique Prefix
Asked in: Google
49. Sorted Array To Balanced BST
Asked in: Amazon
50. K-th largest element in BST
Asked in: Amazon
51. Minimum absolute difference in BST
Asked in: Google
52. Recover Binary Search Tree
Asked in: Amazon, Microsoft
53. Merge Two BST
Asked in: Google, Amazon, Microsoft
54. Lowest Common Ancestor of a BST
Asked in: Amazon, Microsoft
55. K Pairs with Smallest Sums
Asked in: Google
56. Sliding window maximum
Asked in: Amazon, Google
57. Merge K sorted list
Asked in: Amazon, Google
58. Convert a min heap to max heap
Asked in: Google
59. Check if two arrays are equal or not
Asked in: Amazon, Goldman Sachs
60. Intersection of two unsorted array
Asked in: Google, Facebook
61. Longest Consecutive Sequence
Asked in: Amazon, Google
62. Valid Anagram
Asked in: Google, Amazon, Microsoft
63. Majority Element
Asked in: Amazon, Microsoft, Yahoo, Google
64. Sort Characters by Frequency
Asked in: Facebook, Google
65. First Unique Character in a String
Asked in: Amazon, Microsoft
66. Triplet with zero sum
Asked in: Facebook, Amazon, Microsoft
67. First missing positive
Asked in: Amazon
68. Largest subarray with 0 sum
Asked in: Microsoft
69. Max points on the straight line
Asked in: Amazon, Google
70. Climbing Stairs Problem
Asked in: Amazon, Google
71. Matrix Chain Multiplication
Asked in: Amazon, Microsoft
72. Longest Increasing subsequence
Asked in: Amazon, Microsoft, Facebook
73. Partition Equal Subset Sum
Asked in: Amazon, Adobe
74. Minimum number of jumps to reach end
Asked in: Amazon, Google, eBay
75. Interleaving String
Asked in: Google, Microsoft, Yahoo
76. Coin change problem
Asked in: Microsoft
77. Edit distance Problem
Asked in: Amazon, Google, Microsoft
78. Min Cost Path
Asked in: Amazon
79. Maximal Square
Asked in: Google, Microsoft
80. Longest Arithmetic Progression
Asked in: Google, Microsoft
81. Word break problem
Asked in: Facebook, Google
82. Maximum Subarray Sum
Asked in: Amazon, Microsoft, Yahoo, Facebook
83. Palindrome Partitioning
Asked in: Amazon, Google
84. Max Product Subarray
Asked in: Amazon, Microsoft
85. Maximum Product of Three Numbers
Asked in: Amazon
86. Gas station Problem
Asked in: Amazon, Google
87. Distribute Candy Problem
Asked in: Amazon, Microsoft
88. Fractional Knapsack problem
Asked in: Amazon
89. Sudoku Solver
Asked in: Amazon, Google, Microsoft
90. Generate Parentheses
Asked in: Facebook, Microsoft
91. Print all subset
Asked in: Amazon, Microsoft, Facebook
92. Combination Sum
Asked in: Amazon, Facebook, Adobe
93. Combinations
Asked in: Amazon, Adobe
94. Letter Combinations of a Phone Number
Asked in: Google
95. Word ladder problem
Asked in: Google, Microsoft, eBay
96. Smallest Multiple With 0 and 1
Asked in: Amazon
97. Check loop in array according to given constraints
Asked in: Google, Amazon
98. Course Schedule
Asked in: Amazon
99. Knight on chessboard
Asked in: Amazon, Goldman Sachs
100. Surrounded regions
Asked in: Google
Bonus:
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Thanks for reading.
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Thanks
Amit Shekhar
Co-Founder @ Outcome School
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