Plan

Updated: 2023-09-01

3 min read

Q1

#	Problem	Difficulty	Topics
1	1. Two Sum	Easy	Array, Hash Table
2	13. Roman to Integer	Easy	Hash Table, Math, String
3	14. Longest Common Prefix	Easy	String
4	20. Valid Parentheses	Easy	String, Stack
5	21. Merge Two Sorted Lists	Easy	Linked List, Recursion
6	26. Remove Duplicates from Sorted Array	Easy	Array, Two pointers
7	66. Plus One	Easy	Array, Math
8	69. Sqrt(x)	Easy	Math, Binary Search,
9	70. Climbing Stairs	Easy	Math, Dynamic Programming, Memoization
10	88. Merge Sorted Array	Easy	Array, Two pointers, Sorting
11	94. Binary Tree Inorder Traversal	Easy	Stack, Tree, Depth-First Search, Binary Tree
12	2. Add Two Numbers	Medium	Linked List, Math, Recursion
13	3. Longest Substring Without Repeating Characters	Medium	Hash Table, String, Sliding Window
14	5. Longest Palindromic Substring	Medium	String, Dynamic Programming
15	7. Reverse Integer	Medium	Math
16	11. Container With Most Water	Medium	Array, Two pointers, Greedy
17	15. 3Sum	Medium	Array, Two pointers, Sorting
18	17. Letter Combinations of a Phone Number	Medium	Hash Table, String, Backtracking
19	19. Remove Nth Node From End of List	Medium	Linked List, Two pointers
20	22. Generate Parentheses	Medium	String, Dynamic Programming, Backtracking

If you start sketching an intuitive algorithm, then in the process comes an understanding and an improved solution.

Update plan by solution:

#	Problem	Difficulty	Topics
21	28. Find the Index of the First Occurrence in a String	Medium	String, Two pointers, String Matching
22	29. Divide Two Integers	Medium	Math, Bit Manipulation
23	33. Search in Rotated Sorted Array	Medium	Array, Binary Search,
24	34. Find First and Last Position of Element in Sorted Array	Medium	Array, Binary Search,
25	36. Valid Sudoku	Medium	Array, Hash Table, Matrix
26	38. Count and Say	Medium	String
27	46. Permutations	Medium	Array, Backtracking
28	48. Rotate Image	Medium	Array, Math, Matrix
29	49. Group Anagrams	Medium	Array, Hash Table, String, Sorting
30	50. Pow(x, n)	Medium	Math, Recursion
31	53. Maximum Subarray	Medium	Array, Divide and Conquer, Dynamic Programming

Revise training tactics. Prepare list of top coding patterns.

Practice on each coding pattern.

#	Problem	Difficulty	Topics
32	55. Jump Game	Medium	Array, Greedy, Dynamic Programming
33	56. Merge Intervals	Medium	Array, Sorting,
34	62. Unique Paths	Medium	Math, Dynamic Programming, Combinatorics]
35	73. Set Matrix Zeroes	Medium	Array, Hash Table, Matrix
36	75. Sort Colors	Medium	Array, Two Pointers, Sorting
37	78. Subsets	Medium	Array, Backtracking, Bit Manipulation

Started participating in contests.