NEET-CODE-150... But let's even try NeetCode All, and CodeForces

https://neetcode.io/practice
https://codeforces.com

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20 Coding pattern _{src = DesignGurus}

1. Sliding Window
   
2. Islands (Matrix Traversal)
   
3. Two Pointers
   
4. Fast & Slow Pointers
   
5. Merge Intervals
   
6. Cyclic Sort
   
7. In-place Reversal of a LinkedList
   
8. Tree Breadth-First Search
   
9. Tree Depth-First Search
   
10. Two Heaps
    
11. Subset
    
12. Modified Binary Search
    
13. Bitwise XOR
    
14. Top ‘K’ Elements
    
15. K-way Merge
    
16. Topological Sort
    
17. Unbounded Knapsack
    
18. Fibonacci Numbers
    
19. Palindromic Subsequence
    
20. Longest Common Substring