SamH1/cracking-the-coding-interview: :books: Python and C++ solutions with automated unit tests. · GitHub

This repo contains Python and C++ solutions for Gayle Laakmann McDowell's Cracking the Coding Interview 6th Edition. Admittedly, there are lots of other GitHub repos with solutions for this book. But when you're studying and are deeply confused, how do you know that their code actually works? If it's untested, then you don't! That's why the philosophy of this repo is that every solution must have one or more tests using the Python unittest framework or the C++ Catch framework. We enforce the unit tests using Travis CI automated testing ensuring that the solutions are made of living code that gets executed and tested on every single public commit. Reference and contribute solutions with confidence!

Python and C++ unit tests are in tests.py and tests.cpp respectively. Python and C++ solutions are organized by chapter in python_solutions and in cpp_solutions respectively.

git clone https://github.com/alexhagiopol/cracking-the-coding-interview.git
cd cracking-the-coding-interview
make configure

In the root directory, execute the following to run all tests in Python and C++:

make test

This will show exactly which lines are not covered by tests in each Python source file:

pip install coverage
make test_coverage

The goal of this project is to write a tested Python and C++ solution for every problem in the 6th edition of the textbook. I definitely need help! PRs are of course very welcome. The work has become quite time consuming because each solution is living code that actually gets executed. Thus, each solution needs its own small dataset and infrastructure in order to be tested. Just writing the test for a problem is often harder than solving the problem itself. Here are some ways you can help:

0. Fixing mistakes.
1. Solving unsolved problems in either language (see the completion progress table below).
2. Improving existing solutions with better performance or clarity.
3. Adding more unit tests or refactoring to increase the test coverage %.
4. Implementing C++ test coverage measurement using gcov.
5. Integrating automated unit test coverage % measurement and reporting for both Python and C++ via Coveralls.

If you have any contributions, please make a PR to the master branch. Feel free to message me for clarification on any of the above items.

1. Chapter 1 - Arrays and Strings: 9 / 9 complete.
2. Chapter 2 - Linked Lists: 8 / 8 complete.
3. Chapter 3 - Stacks and Queues: 6 / 6 complete.
4. Chapter 4 - Trees and Graphs: 11 / 12 complete.
5. Chapter 5 - Bit Manipulation: 7 / 7 complete.
6. Chapter 6 - Math and Logic: 0 / 10 complete.
7. Chapter 7 - Object Oriented Design: 0 / 12 complete.
8. Chapter 8 - Recursion and Dynamic Programming: 11 / 14 complete.
9. Chapter 9 - System Design and Scalability: N/A
10. Chapter 10 - Sorting and Searching: 0 / 11 complete.
11. Chapter 11 - Testing: N/A
12. Chapter 12 - C and C++: N/A
13. Chapter 13 - Java: N/A
14. Chapter 14 - Databases: N/A
15. Chapter 15 - Threads and Locks: 0 / 4 complete.
16. Chapter 16 - Moderate: 1 / 26 complete.
17. Chapter 17 - Hard: 3 / 26 complete.

Total: 55 / 145

1. Chapter 1 - Arrays and Strings: 3 / 9 complete.
2. Chapter 2 - Linked Lists: 2 / 8 complete.
3. Chapter 3 - Stacks and Queues: 0 / 6 complete.
4. Chapter 4 - Trees and Graphs: 0 / 12 complete.
5. Chapter 5 - Bit Manipulation: 4 / 7 complete.
6. Chapter 6 - Math and Logic: 0 / 10 complete.
7. Chapter 7 - Object Oriented Design: 0 / 12 complete.
8. Chapter 8 - Recursion and Dynamic Programming: 5 / 14 complete.
9. Chapter 9 - System Design and Scalability: N/A
10. Chapter 10 - Sorting and Searching: 0 / 11 complete.
11. Chapter 11 - Testing: N/A
12. Chapter 12 - C and C++: 0 / 6
13. Chapter 13 - Java: N/A
14. Chapter 14 - Databases: N/A
15. Chapter 15 - Threads and Locks: 0 / 4
16. Chapter 16 - Moderate: 0 / 26 complete.
17. Chapter 17 - Hard: 0 / 26 complete.

Total: 14 / 151