This post consists links to all the good articles I have found on leetcode. I am not the author of these articles and I am grateful to the people who wrote them.

1)Dynamic Programming

• https://leetcode.com/discuss/general-discussion/458695/dynamic-programming-patterns
• https://leetcode.com/discuss/interview-question/1986802/Dynamic-Programming
• https://leetcode.com/discuss/general-discussion/662866/DP-for-Beginners-Problems-or-Patterns-or-Sample-Solutions
• https://leetcode.com/discuss/general-discussion/1000929/solved-all-dynamic-programming-dp-problems-in-7-months#:~:text=There%20are%20total%20241%20dp,only%20solved%20the%20public%20ones.&text=Then%20I%20started%20to%20solve,my%20monthly%20problem%20list%20here.&text=The%20average%20pace%20was%20about%201%20problem%20per%20day.

2)Linked List

• https://leetcode.com/discuss/study-guide/1800120/Become-Master-In-Linked-List
• https://leetcode.com/discuss/study-guide/2725900/Linked-list-study-guide

3)Two pointers

• https://leetcode.com/discuss/study-guide/1688903/Solved-all-two-pointers-problems-in-100-days
• https://leetcode.com/discuss/study-guide/1905453/master-in-two-pointer

4)Stack & Queue

• https://leetcode.com/discuss/study-guide/3168516/A-general-approach-to-stack-problems-in-C%2B%2B-or-Generic-Template
• https://leetcode.com/discuss/study-guide/5085517/Templates-for-monotonic-stacks-and-queues-(with-solved-problems)/

5)Graphs

• https://leetcode.com/discuss/study-guide/1326900/graph-algorithms-problems-to-practice
• https://leetcode.com/discuss/study-guide/2360573/become-master-in-graph
  • Union Find: https://leetcode.com/discuss/general-discussion/1072418/Disjoint-Set-Union-(DSU)Union-Find-A-Complete-Guide

6)Prefix Sum

• https://leetcode.com/problems/subarray-sum-equals-k/solutions/867435/detailed-explanation-of-math-behind-o-n-solution-python3/

7)Sliding Window

• https://leetcode.com/problems/frequency-of-the-most-frequent-element/solutions/1175088/C++-Maximum-Sliding-Window-Cheatsheet-Template/

8)Back tracking

• https://leetcode.com/discuss/study-guide/2244368/backtracking-for-beginners-problems
• https://leetcode.com/discuss/general-discussion/680269/a-general-approach-to-backtracking-problems-in-cexhaustive-searching

9)Tree

• https://leetcode.com/discuss/study-guide/1337373/Tree-question-pattern-oror2021-placement
• https://leetcode.com/discuss/study-guide/5020529/Master-Tree-Patterns/
• https://leetcode.com/discuss/study-guide/1212004/Binary-Trees-study-guide

10)Recusrion

• https://leetcode.com/discuss/study-guide/1733447/Become-Master-In-Recursion

11)Heap

• https://leetcode.com/discuss/general-discussion/1127238/master-heap-by-solving-23-questions-in-4-pattern-categories
• https://leetcode.com/discuss/study-guide/2773740/Important-Patterns-in-HeapPriority-Queue-with-link-to-problems

12)Binary Search

• https://leetcode.com/discuss/study-guide/1233854/a-noobs-guide-to-the-binary-search-algorithm
• https://leetcode.com/discuss/study-guide/786126/Python-Powerful-Ultimate-Binary-Search-Template.-Solved-many-problems

13)Greedy

• https://leetcode.com/discuss/general-discussion/1061059/ABCs-of-Greedy

14)Bits Manipulation

• https://leetcode.com/discuss/interview-question/3695233/all-types-of-patterns-for-bits-manipulations-and-how-to-use-it

15)Strings

• https://leetcode.com/discuss/interview-question/2001789/collections-of-important-string-questions-pattern

16)String Matching

• https://leetcode.com/discuss/post/6587919/string-matching-algorithms-based-questio-w4ac/

Following article contains the list of questions topic wise

QUESTIONS LIST

• https://leetcode.com/discuss/interview-question/2069641/the-only-lists-you-need-for-your-interview-preparation

System Design Articles

• https://leetcode.com/discuss/study-guide/3611301/Complete-System-Design-Case-Studies-%3A-Bookmark-it
• https://leetcode.com/discuss/general-discussion/2340482/system-design-template-that-landed-me-to-google
• https://leetcode.com/discuss/general-discussion/2341201/object-oriented-design-template-that-landed-me-to-google