Basic Data Structures:

Here’s the proper roadmap:
Foundational Knowledge

Basic Data Structures:
- Arrays
- Linked Lists
- Stacks
- Queues
- Hash Tables/Hash Maps
- Strings

Fundamental Algorithms:
- Sorting (Bubble Sort, Quick Sort, Merge Sort, etc.)
- Searching (Binary Search, Linear Search)
- Basic String Manipulations (Substrings, Palindromes, Anagrams)
- Intermediate Knowledge

Advanced Data Structures:
- Trees (Binary Trees, Binary Search Trees, AVL Trees, Segment Trees)
- Heaps
- Graphs (Representation, Traversal techniques - BFS, DFS)
- Tries

Advanced Algorithms:
- Dynamic Programming
- Greedy Algorithms
- Backtracking
- Divide and Conquer
- Bit Manipulation
- Advanced Topics

Complex Data Structures:
- Red-Black Trees
- B-Trees
- Fenwick Trees (Binary Indexed Trees)
- Suffix Trees/Arrays

Complex Algorithms:
- Advanced Graph Algorithms (Dijkstra’s, Floyd-Warshall, A*)
- Network Flow (Ford-Fulkerson)
- Computational Geometry
- String Matching Algorithms (KMP, Rabin-Karp)
- Problem-Solving Skills

Practice:
Solve problems on platforms like LeetCode, HackerRank, CodeSignal, and Codeforces.
Aim to solve problems of varying difficulty (Easy, Medium, Hard).
Understanding:

Understand the underlying principles and logic behind algorithms and data structures.
Be able to explain your thought process and solutions clearly.

Time and Space Complexity:
- Analyze and optimize the time and space complexity of your solutions.
- Be comfortable with Big O notation and its implications.
- Company-Specific Focus

Big Tech Companies (FAANG - Facebook, Amazon, Apple, Netflix, Google):
- Extensive and in-depth understanding of DSA.
- Focus on medium to hard problems on LeetCode.
- Prepare for system design interviews if applying for senior positions.

Mid-Sized Tech Companies:
- Good grasp of fundamental and intermediate DSA.
- Practice problems on LeetCode and HackerRank (mainly easy to medium).
- Be ready for coding interviews and practical coding tests.

Startups and Small Companies:
- Solid understanding of basic and some intermediate DSA.
- Focus on practical problem-solving skills and coding abilities.
- Emphasize on your ability to learn and adapt quickly.

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