Data structure and algorithms for interviews 2023

Covers around 200+ most popular coding interview problems ranging from a variety of topics.

1. Two Pointers
2. Easy
3. Pair with Target Sum
4. Remove Duplicates
5. Squaring a Sorted Array
6. Medium
7. Triplet Sum to Zero
8. Triplet Sum Close to Target
9. Triplets with Smaller Sum
10. Subarrays with Product Less than a Target
11. Dutch National Flag Problem
12. Fast & Slow Pointers
13. Easy
14. Middle of the LinkedList
15. LinkedList Cycle
16. Medium
17. Start of LinkedList Cycle
18. Happy Numbers
19. Bitwise Manipulation
20. Single Numbers
21. Single Number II
22. Single Number III
23. Flipping the image
24. Sliding Window
25. Easy
26. Maximum Sum Subarray of Size K
27. Smallest Subarray With a Greater Sum
28. Medium
29. Longest Substring with maximum K Distinct Characters
30. Fruits into Baskets
31. Hard
32. Longest Substring with Distinct Characters
33. Longest Substring with Same Letters after Replacement
34. Longest Subarray with Ones after Replacement
35. Arrays
36. Medium
37. Group Anagrams
38. Hard
39. Trapping Rain Water
40. Merge Intervals
41. Medium
42. Intervals Intersection
43. Conflicting Appointments
44. Linked List
45. Easy
46. Reverse a Linked List
47. Medium
48. Reverse a sub list
49. Reverse a k-element sub list
50. Two Heaps
51. Medium
52. Find the median of a number stream
53. Hard
54. Maximum Capital
55. Sliding Window Median
56. Top k elements
57. Easy
58. Top ‘K’ Numbers
59. Kth Smallest Number
60. ‘K’ Closest Points to the Origin
61. Connect Ropes
62. Medium
63. Top ‘K’ Frequent Numbers
64. Frequency Sort
65. Kth Largest Number in a Stream
66. ‘K’ Closest Numbers
67. Maximum Distinct Elements
68. Sum of Elements
69. Hard
70. Rearrange String
71. K-way merge
72. Binary Search
73. Greedy Technique
74. Backtracking
75. 1D Dynamic programing
76. 2D Dynamic programing
77. Cyclic Sort
78. Topological Sort
79. Stacks
80. Queues
81. Depth First Search
82. Breadth First Search
83. Trie
84. Hash Maps
85. Math Tricks
86. Miscellaneous