Cracking the Coding Interview

Rustam-Z🚀 • 8 June 2021

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Contents

• General plan
• How to approach solving algorithm?
• Algorithms & data structures topics
• Algorithms learning preparation plan
• System Design
• Extra Resources

General plan

1. Learn DS and Algorithms
2. Solve algorithms
3. Repeat concepts
4. Learn System Design
5. Write a resume
6. Prepare for a behavioral interview
7. Find people for referral and apply
8. Pass the interview
9. Get an offer, and negotiate salary! 🍾

How to approach solving the algorithm?

Constraints, Ideas, Complexities, Code, and Tests

1. Read the problem. Don’t immediately jump into coding!
2. Understand inputs & outputs. Draw some examples on paper.
3. Ask questions, and find constraints. Find edge cases. Example questions: is it ASCII or Unicode? what is the Max value? is there a difference between capital letters and small letters?
4. Thinking about the solution in mind. Divide problems into sub-problems.
5. Evaluate the complexity
6. Think better alternative solution
7. Write code on paper
8. Debug your code on paper and test with new corner case inputs
9. Write code and write tests

Algorithms Learning Plan

• The Last Algorithms Course You'll Need
• interviewbit.com & interviewcake.com & programiz.com/dsa
• LeetCode Explore
• LeetCode study plan — Data Structure 1, Algorithm 1, Programming Skills 1
• "Cracking the coding interview" + CTCI problems in LeetCode
• LeetCode study plan — Data Structure 2, Algorithm 2, Programming Skills 2
• AlgoExpert video solutions
• neetcode.io & NeetCode playlist
• LeetCode company tagged questions

System Design Learning Plan

• "Systems Expert" from AlgoExpert
• "System Design Interview" book - 1^st and 2^nd editions
• "Grokking the System Design Interview" (educative.io)
• "Designing Data-Intensive Applications" book
• Tushar

Extra Resources

• Article by Sergey Sema
• InterviewPreparationGuide.pdf
• faang-interview.github.io
• docs.outtalent.com/guides
• Coding interview tips

Algorithms & Data Structures Readings

• https://www.hiredintech.com/classrooms/algorithm-design/lesson/78
• https://www.techinterviewhandbook.org/algorithms/study-cheatsheet/
• https://medium.com/swlh/taking-the-edge-off-of-edge-cases-7b3008d83a57

Topics

• Big-O = how quickly the runtime grows relative to the input as the input gets arbitrarily large.
• Strings
  • ASCII, Unicode
  • How are strings implemented in your programming language (for example, is there a maximum length)?
  • Search for substrings (for example, the Rabin-Karp algorithm).
  • RegEx
• Arrays
  • Details of implementation in your programming language. For example, for C++ you need to know the implementation using pointers, and vectors. For vectors, you also need to know, for example, that it periodically does resize, and other similar details.
• Linked lists
  • Singly linked list
  • Doubly linked list
• Stacks and Queues
• Trees
  • DFS, BFS
  • Adding and removing elements
  • Less common tree types (e.g., red black trees, B-trees) - what are they, how they differ from the binary trees, basic complexities, and how they are used. No need to know all the rotations in the RB-tree, for example.
  • Tries
• Heaps
  • Heap sort
  • Using heaps for tracking top-K
  • Allocating elements on a heap vs on a stack - what does it mean?
• Graphs
  • DFS, BFS
  • Topological search
  • Shortest path
• Hash
  • Hash functions
  • Universal hash
• Algorithms
  • Sorting
    • Especially make sure you know heap sort, merge sort and quick sort.
  • Searching
    • Binary search
    • Searching in linked lists, arrays, trees, graphs, dictionaries...
  • Dynamic programming = problems, which are problems where the solution is composed of solutions to the same problem with smaller inputs.
    • Bottom-up
    • Top-down
  • Backtracking = Backtracking is an algorithmic technique for solving problems recursively by trying to build a solution incrementally, one piece at a time.
  • Greedy algorithms
  • Recursion