A list of grouped leetcode DSA problems with solutions that helps one prepare well for a coding interview.

1. https://goodtecher.com/
2. https://github.com/iverson52000/DataStructure_Algorithm
3. https://zhaonanli.gitbooks.io/leetcode/content
4. https://somjang.tistory.com/entry/leetCode-729-My-Calendar-I-Python?category=351755
5. https://leetcode.xnerv.wang/zigzag-conversion/
6. https://techlarry.github.io/Leetcode/202.%20Happy%20Number/
7. https://adit0503.gitbook.io/leetcode/200.-number-of-islands
8. https://velog.io/@jiselectric/Leetcode-Powx-n
9. https://github.com/kdn251/interviews/tree/master/leetcode
10. https://mrleonhuang.gitbooks.io/lintcode/content
11. https://leetcode.com/discuss/general-discussion/494279/comprehensive-data-structure-and-algorithm-study-guide
12. https://quanticdev.com/algorithms/dynamic-programming/sliding-window/
13. https://github.com/jwasham/code-catalog-python/blob/master/catalog/suggested/
14. https://igotanoffer.com/blogs/tech/google-software-engineer-interview
15. https://youtube.com/channel/UC_mYaQAE6-71rjSN6CeCA-g
16. https://walkccc.me/LeetCode/problems/0009/
17. https://linlaw0229.github.io/
18. https://czxttkl.com/category/leetcode/
19. https://hercy.me/
20. https://github.com/jiselectric/Algorithm
21. https://github.com/xizhengszhang/Leetcode_company_frequency/blob/master/Summary/leetcode%20Notes.pdf

1. https://seanprashad.com/leetcode-patterns/
2. https://docs.google.com/spreadsheets/d/1A2PaQKcdwO_lwxz9bAnxXnIQayCouZP6d-ENrBz_NXc/edit#gid=0
3. https://leetcode.com/list/xi4ci4ig/
4. https://leetcode.com/discuss/interview-question?currentPage=1&orderBy=hot&query
5. https://www.teamblind.com/post/New-Year-Gift---Curated-List-of-Top-75-LeetCode-Questions-to-Save-Your-Time-OaM1orEU

1. https://afteracademy.com/tech-interview/system-design/top-questions
2. https://github.com/shashank88/system_design
3. https://thinksoftware.medium.com/how-to-ace-object-oriented-design-interviews-4f9a667e0780
4. https://www.thinksoftwarelearning.com/courses/SystemDesignBible

1. 2D DFS - [79, 130, 200, 695] DP - [62, 63, 64, 221, 1594]
2. BINARY SEARCH [33, 34, 69, 74, 153, 162, 374]
3. TREES BFS - [102, 199, 1161, 107, 103, 513, 515]
4. STACK [20, 155, 232, 225, 316, 678, 739, 844]
5. DESIGN [146, 359, 380, 384, 621, 933]

1. https://www.lewuathe.com/radix-sort-in-python.html
2. https://stackabuse.com/radix-sort-in-python/
3. https://www.geeksforgeeks.org/python-program-for-radix-sort/
4. https://www.alphacodingskills.com/python/pages/python-program-for-radix-sort.php#:~:text=Python%20Program%20-%20Radix%20Sort%20Radix%20sort%20is,counting%20sort%20as%20a%20subroutine%20to%20perform%20sorting.