Must do questions for software engineering interviews - LeetCode

These questions are in no particular order. Every question will give you enough exposure to strategies and techniques required to solve most of the problem solving & data structures related questions in the interviews.

Some of the techniques used in these problems are two pointers, invariant windows, binary search, DFS/BFS, recursion, interval scheduling related, simple DP and bit manipulation, heaps, data structure design etc.

1. Two Sum
2. 3Sum
3. Combination Sum
4. Minimum Window Substring
5. Maximum Subarray
6. Longest substring without repeating characters
7. Longest Palindromic Substring
8. Longest repeating character replacement
9. Search in a rotated sorted array
10. Maximum Subarray
11. Spiral Matrix
12. Rotate Image
13. Container with most Water
14. Best Time to Buy and Sell Stock
15. Remove Nth Node from end of a list
16. Maximum Product Subarray
17. Reverse LinkedList
18. Product of Array Except Self
19. Find minimum in rotated sorted array
20. Valid Parenthesis
21. Merge two sorted lists
22. Merge K sorted lists
23. Group Anagrams
24. Merge Intervals
25. Meeting Rooms
26. Meeting Rooms ||
27. Minimum Number of arrows to burst balloons
28. Insert Interval
29. Unique Paths
30. Jump Game
31. Climbing Stairs
32. Set Matrix Zeros
33. Word Search
34. Word Search ||
35. Validate Binary Search Tree
36. Binary Tree Level Order Traversal
37. Maximum Depth of a Binary Tree
38. Binary Tree from Preorder and Inorder traversals
39. Binary Tree Maximum Path Sum
40. Invert Binary Tree
41. Kth Smallest Element in a BST
42. Lowest Common Ancestor in a BST
43. Serialize and deserialize binary tree
44. Subtree of Another Tree
45. Number of connected components in an undirected graph
46. Clone Graph
47. Valid Palindrome
48. Longest Consecutive Sequence
49. Word Break
50. Decode Ways
51. Linked List Cycle
52. Reorder List
53. Reverse Bits
54. Number of 1 Bits
55. House Robber
56. House Robber ||
57. Number of Islands
58. Implement Trie
59. Add and Search Word - DS Design
60. Contains Duplicate
61. Course Schedule
62. Valid Anagram
63. Group Valid Tree
64. Missing Number
65. Alien Dictionary
66. Encode And Deode Strings
67. Find Median from data stream
68. Longest Increasing Subsequence
69. Coin Change
70. Counting Bits
71. Top K frequent elements
72. Sum of Two Integers
73. Pacific Atlantic Water flow
74. Non Overlapping Intervals