1. Core Java
2. Core Java 1.8
3. Spring & Spring Boot
5. Hibernate
6. Data Structures
7. Algorithms
8. Problem Solving using DataStructures and Algorithm
9. SQL
10. System Design (Back Envelop Calculations) etc
11. Operating System
12. miscellaneous

🔌 TimeComplexity

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1. Exmaples

1.Data Structures

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1. Recursion
2. Stacks
3. Queues
4. Linked List
5. Trees
6. Hashing
7. Graphs
8. Binomial Heap
9. Fibonacci Heap
10. Skip List
11. Red Black Trees
12. Tries
13. Ternary Search
14. Segment Trees
15. Splay Trees

2.Algorithm

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1. Analysis
2. Searching and Sorting
3. Divide and Conquer
4. Greedy
   geeksforgeeks
   hackerearth
5. Back Tracking
   hackerearth
   gfg-intro
   gfg-qsn
6. Dynamic Programming
   hackerearth
   gfg-qsn
7. Complexity Classes
8. Randomized Algo
9. Bruite Force
10. Recursion

3.Problem Solving using Data Structures and Algorithms

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1. Arrays
2. Linked Lists
3. Stacks
4. Queues
5. Trees
6. BST
7. Heaps
8. String
9. Divide and Conquer
10. Backtracking
    sudoku
11. Greedy
12. Pattern Searching and Mactching
13. Dynamic Programming
14. Bit Manipulation
15. Mathematical Algorithms

4.Companies

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1. Google .
   prepration

2. Facebook

3. Apple

4. ..Amazon ..

5. PayPal .

6. Directi .

7. ThoughtWorks

8. .. OYO ...
   Round1: Puzzle,DB,System Design
   Round2: System Design for OYO usecase

9. Visa .

10. Flipkart(walmart labs).

11. Myntra .

12. VMware

13. Citrix

14. Oracle .

15. Cisco

16. Netapp

17. Goldman Sachs ..

18. Morgab Stanly

19. Visa .

20. Uber

21. Ola

22. Adobe

23. Mentor Graphics

24. Saplabs

25. Juniper

26. Mathworks

27. Intel

28. Nvidia

29. Dell

30. EMC

31. American Express .

32. Expedia .

33. Cevant .

34. Gartner .

35. Grofers .

36. Zomato .

37. .Paytm .
    Round 1: list, Map put and get implementation
    Round 2: Trees, System Design
    Round 3: DB,core-java,Collection hierarchies,join

38. KPMG

39. Monster

40. PayU .

41. TowerResearch

42. Intuit 2 Microsoft

43. Jp Morgan & Co

44. Hackerrank

45. Goldman Sachs

46. Arcesium

47. D.E. Shaw

48. McAfee

49. Atlassian

50. Codenation

51. Uber

52. Flipkart

53. Gitlab

54. InMobi

55. LinkedIn

56. Morgan Stanley

57. Paytm

58. PayPal

59. Tower Research Capital

60. Gojek

61. Nasdaq

62. MindTickle

63. Informatica

64. Zeta Suite

65. Razor Pay

66. Udaan

67. Myntra

68. Adobe

69. CureFit

70. ShareChat

71. Ola

72. Expedia

73. Sprinklr

74. Nutanix

75. Zomato

76. Yelp

77. ByteDance

78. Dunzo

79. MakeMyTrip

80. Toppr

81. VMWare

82. Intel Corporation

83. Postman

84. Walmart

85. Oracle

86. ThoughtWorks

87. Directi

88. Swiggy

89. Innovacer

90. Mastercard

91. Visa

92. Samsung

93. Media Dot Net

94. Cisco

95. Cred

96. Urban Company

97. Sumologic

98. Coinbase

99. Stripe

100. Twilio

https://docs.google.com/spreadsheets/d/1-o4HQjk9YoTECT4xxO_39MIR7CiK2X6-TaBmFngt8dQ/edit

5.Study Material

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1. Books
2. Question pdf