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MACHINE LEARNING INTERVIEW PREPARATION

Image

RESOURCES

BOOKS

  • Data Structures & Algorithms in Python -Michael T. Goodrich
  • Deep Learning Interviews -Shlomo Kashani

EASY QUESTIONS

Name of Question Status of Completion Solution
1. Two Sum ✅✅✅✅ Python Python
2. Roman to Integer ✅✅✅ Python
3. Longest Common Prefix ✅✅ Python
4. Intersection of Two Arrays II ✅✅ Python Python
5. Reverse String ✅ Image
6. Move Zeroes ✅ Image
7. Reverse Linked List ✅✅✅ Python Java
8. Revising Select Query II ✅☮ Image
9. Revising Select Query I ✅☮ SQL
10. Select All ✅☮ SQL
11. Select By ID ✅☮ SQL
12. Sqrt ✅ Image
13. Merge Sorted Array ✅ Image
14. Majority Element ✅✅ Image
15. First Unique Character in String ✅ Image
16. Climbing Stairs ✅✅✅ Python Python
17. Japanese Cities Names ✅☮ SQL
18. Plus One ✅ Image
19. Contains Duplicate ✅✅✅ Python Python
20. Pascal's Triangle ✅ Image
21. Delete Node in a Linked List ✅ Image
22. Valid Parentheses ✅✅✅ Python Python
23. Merge Two Sorted Lists ✅✅✅ Python Java
24. Valid Palindrome ✅✅ Python Python
25. Japanese Cities Names II ✅☮ Image
26. Maximum Depth of Binary Tree ✅ Python
27. Convert Sorted Array to Binary Search Tree ✅✅ Python Python
28. Maximum Subarray ✅✅ Image
29. Power of Three ✅ Image
30. Excel Sheet Column Number ✅ Python Java
31. Excel Sheet Column Title ✅ Image
32. Missing Number ✅✅✅ Python Java
33. Single Number ✅✅ Image
34. Best Time to Buy and Sell Stock ✅✅✅✅ Python Python
35. Remove Duplicates from Sorted Array ✅ Image
36. Fizz Buzz ✅ Image
37. Valid Anagram ✅✅ Python Python Python
38. Binary Tree Inorder Traversal ✅✅ Python Python
39. Symmetric Tree ✅ Image
40. Minimum Absolute Difference ✅ Image
41. Power of Two ✅✅ Python Java
42. Add Binary ✅ Image
43. Intersection of Two Linked Lists ✅✅ Python
44. Implement Str ✅ Image
45. Remove Linked List Elements ✅✅ Image
46. Invert Binary Tree ✅✅✅ Python Python
47. First Bad Version ✅ Image
48. Add Strings ✅ Image
49. Longest Continuous Increasing Subsequence ✅ Image
50. Valid Palindrome II ✅ Image
51. Unique Email Addresses ✅ Image
52. Verifying Alien Dictionary ✅ Image
53. Squares of Sorted Array ✅✅ Image
54. Remove All Adjacent Duplicates ✅✅ Python
55. Linked List Cycle ✅✅ Python Java
56. Find All Numbers Disappeared in Array ✅✅✅ Python Java
57. Range Sum Query ✅ Image
58. Palindrome Linked List ✅✅ Python Java Java
59. Remove Duplicates from Sorted List ✅✅ Python Java
60. Peak Index in a Mountain Array ✅✅ Python Java
61. Average of Levels in Binary Tree ✅ Image
62. Minimum Depth of Binary Tree ✅ Image
63. Same Tree ✅✅ Python Python
64. Path Sum ✅✅ Python Python
65. Diameter of Binary Tree ✅✅ Python Python
66. Lowest Common Ancestor of a Binary Search Tree ✅✅ Python Python
67. Subtree of Another Tree ✅✅ Python Python
68. Backspace String Compare ✅✅ Python
69. Word Pattern ✅ Image
70. Type of Triangle ✅☮ SQL
71. Find Numbers with Even Number of Digits ✅ Image
72. Richest Customer Wealth ✅ Image
73. Find Smallest Letter Greater Than Target ✅ Image
74. Set Mismatch ✅ Java
75. Flipping an Image ✅ Java
76. Number of Steps to Reduce Number to Zero ✅ Java
77. Happy Number ✅ Java
78. Middle of the Linked List ✅ Java
79. Balanced Binary Tree ✅ Python
80. Merge Two Binary Trees ✅ Python
81. Combine Two Tables ✅☮ SQL
82. Employees Earning More Than Their Managers ✅ SQL
83. Binary Search ✅ Python
84. Implement Stack Using Queues ✅ Python
85. Shift 2D Grid ✅ Python
86. Find Pivot Index Python
87. Big Countries ✅☮ SQL
88. Recyclable and Low Fat Products ✅☮ SQL
89. Min Cost Climbing Stairs ✅ Python

MEDIUM QUESTIONS

Name of Question Status of Completion Solution
1. Add Two Numbers ✅✅ Python Python
2. Longest Substring Without Repeating Characters ✅✅ Python Python
3. Letter Combinations of a Phone Number ✅ Image
4. Remove Nth Node from End of List ✅✅ Python Python
5. Divide Two Integers ✅ Image
6. Next Permutation ✅ Image
7. Find First and Last Position of Element ✅✅ Python Java
8. Combination Sum ✅✅ Python
9. Combination Sum II ✅✅ Python Python
10. Permutations ✅✅ DFS Python
11. Merge Intervals ✅ Image
12. Unique Paths II ✅✅ Python
13. Simplify Path ✅ Image
14. Validate Binary Search Tree ✅ Image
15. Binary Tree Level Order Traversal ✅ Python Python
16. Construct Binary Tree from Preorder and Inorder ✅ Image
17. Populating Next Right Pointers in Each Node ✅✅ Python Python
18. Clone Graph ✅✅ Python Python
19. Copy List with Random Pointer ✅✅ Python Python
20. Word Break ✅✅ Python Python
21. Find Minimum in Rotated Sorted Array ✅✅ Python Python
22. Binary Search Tree Iterator ✅✅ Python Python
23. Rotate Array ✅ Image
24. Binary Tree Right Side View ✅✅ Python Python
25. Course Schedule ✅ Python Python
26. Course Schedule II ✅ Image
27. Design Add and Search Words DS ✅✅ Python Python
28. String to Integer ✅ Image
29. Kth Largest Element in an Array ✅ Image
30. The PADS ✅☮ SQL
31. Basic Calculator ✅ Image
32. Lowest Common Ancestor of Binary Tree ✅ Image
33. Product of Array Except Self ✅✅ Python Python
34. Peeking Iterator ✅ Image
35. Coin Change ✅✅ Python Python
36. Linked List Cycle II ✅✅ Python Java Java
37. Koko Eating Bananas ✅ Image
38. Gas Station ✅ Image
39. Decode String ✅ Image
40. Integer Replacement ✅ Image
41. Partition Equal Subset Sum ✅ Image
43. Sequential Digits ✅ Image
44. Pacific Atlantic Water Flow ✅ Image
45. Path Sum III ✅ Image
46. Continuous Subarray Sum ✅ Image
47. Single ELement in a Sorted Array ✅ Image
48. Subarray Sum Equals K ✅ Image
49. Design Circular Deque ✅ Image Image
50. Find K Closest Elements ✅ Image
51. Maximum Swap ✅ Image
52. Top K Frequent Words ✅ Image
53. UTF-8 Validation ✅ Image
54. Accounts Merge ✅ DFS Union
55. All Elements in Two Binary Search Trees ✅ DFS
56. Is Graph Bipartite ✅ BFS DFS
57. Cheapest Flights Within K Stops ✅ Image
58. Maximum XOR of Two Numbers in an Array ✅ Image Image
59. All Nodes Distance K in Binary Tree ✅ Image Image
60. Occupations ✅☮ SQL
61. Minimum Add to Make Parentheses Valid ✅ Image
62. Check Completeness of a Binary Tree ✅ Image
63. Find Peak Element ✅ Java
64. Search in Rotated Array ✅✅ Java Java Python
65. Find the Duplicate Number ✅✅ Java Python
66. Find All Duplicates in an Array ✅ Java
67. Spiral Matrix ✅ Java
68. Pancake Sorting ✅ Java
69. K Closest Points to Origin ✅ Python
70. Permutations in String ✅ Python
71. Reverse Integer ✅ Java
72. Subsets ✅ Java
73. Minimum Cost For Tickets ✅ Python
74. Longest Palindromic Substring ✅ Python
75. Swap Nodes in Pairs ✅ Python
76. Container With Most Water ✅✅ Python
77. Two Sum II ✅ Python
78. 3Sum ✅ Python
79. Generate Parentheses ✅ Python
80. Reorder List ✅✅ Python Java Java
81. Implement Trie (Prefix Tree) ✅ Python
82. Sort Colors ✅ Python
83. Count Sub Islands ✅ Python
84. Sort List ✅ Python Python
85. Reverse Linked List II ✅✅ Java Python
86. Rotate List ✅✅ Java Python
87. Word Search ✅ Python
88. Top K Frequent Elements ✅ Python
89. Unique Paths ✅ Python
90. Permutations II ✅ Python
91. Count Good Nodes in Binary Tree ✅ Python
92. Second Highest Salary ✅☮ SQL
93. Triangle ✅ Python
94. Sum Root to Leaf Numbers ✅ Python
95. Unique Binary Search Trees ✅ Python
96. Kth Smallest Element in a BST ✅ Python
97. House Robber III ✅ Python
98. Flip Equivalent Binary Trees ✅ Python
99. Flatten Binary Tree to Linked List ✅ Python
100. Find Bottom Left Value ✅ Python
101. Trim a Binary Search Tree ✅ Python
102. Recover Binary Search Tree ✅ Python
103. Partition List ✅ Python
104. Remove All Adjacent Duplicates in String II ✅ Python
105. Rotate Image ✅ Python
106. Network Delay Time ✅ Python
107. Deepest Leaves Sum ✅ Java
108. Jump Game ✅ Python
109. Check If a String Contains All Binary Codes ✅ Python
110. Car Pooling ✅ Python
111. 132 Pattern ✅ Python
112. Palindromic Substring ✅ Python
113. Search Suggestions System ✅ Python
114. Longest Increasing Subsequence ✅ Python
115. Longest Common Subsequence ✅ Python
116. House Robber ✅✅ Python
117. House Robber II ✅✅ Python
118. Decode Ways Python
119. Group Anagrams Python
120. Search a 2D Matrix Python
121. Kth Smallest Element in a Sorted Matrix Python
122. Longest Consecutive Sequence Python
123. Longest Repeating Character Replacement ✅ Python
124. Non-Decreasing Array ✅ Python

HARD QUESTIONS

Name of Question Status of Completion Solution
1. Split Array Largest Sum ✅ Java
2. First Missing Positive ✅ Java
3. Serialize and Deserialize Binary Tree ✅ Python
4. Binary Tree Maximum Path Sum ✅ Python
5. Merge K Sorted Lists ✅ Python