Solutions in C and C++ to Miscellaneous Programming Problems

This is a repository of modern coding showcases and solutions to various popular programming problems, written in C90, C++17, C++20, and C++23.

For some of the said problems, multiple solutions of varying efficiencies and trade-offs are provided, along with benchmarks.

All solutions are driven by extensive automated testing, in addition to being statically and dynamically analyzed, and compiled under strict rules with the latest Clang, GCC, and MSVC compilers.

Technical showcases

The following is a partial list of standards, practices, paradigms, and tools leveraged by this project:

• C (standard C90) and C++ (standard C++17, C++20, and C++23)
• The C and C++ standard libraries
• Strongly-typed approach, leveraging C++ templates and C++20 concepts
• Const correctness where applicable--except for fields
• Functional programming
• Strict standard conformance and strict compilation rules
• Static analysis with Clang Tidy and Microsoft C++ Code Analysis
• Dynamic analysis
• LLVM-based sanitizer tools
• CMake
• Clean Git history and configuration
• Extensive testing using Catch2 and CTest
• Development dependency management using vcpkg
• Own opinionated Clang Format configuration
• Conventional Commits
• GitHub Actions CI
• Benchmarking using nanobench
• Microsoft DevSkim
• EditorConfig
• Markdown
• Diagraming with Mermaid

Index

Problem	Standard	Source
Add two numbers	C++17	src/forfun/add_two_numbers.cpp
Add two numbers (in C)	C90	src/forfun_c/add_two_numbers.c
Balanced binary tree	C++17	include/forfun/graph/balanced_binary_tree.hpp
Best time to buy and sell stock	C++20	include/forfun/best_time_to_buy_and_sell_stock.hpp
Binary search	C++20	include/forfun/search/binary_search.hpp
Breadth-first search	C++20	include/forfun/graph/breadth_first_search.hpp
Bubble sort	C++20	include/forfun/sorting/bubble_sort.hpp
Concatenation of array	C++17	include/forfun/array_concatenation.hpp
Contains duplicate	C++20	include/forfun/contains_duplicate.hpp
Depth-first search	C++20	include/forfun/graph/depth_first_search.hpp
Evaluate reverse polish notation	C++23	include/forfun/evaluate_reverse_polish_notation.hpp
Factorial	C++23	include/forfun/factorial.hpp
Fibonacci sequence	C++20	include/forfun/fibonacci_sequence.hpp
First missing positive	C++20	include/forfun/first_missing_positive.hpp
Fizz buzz	C++20	include/forfun/fizzbuzz.hpp
Forward list	C++20	include/forfun/container/forward_list.hpp
Greatest common divisor	C++17	include/forfun/gcd.hpp
Insertion sort	C++20	include/forfun/sorting/insertion_sort.hpp
Last stone weight	C++20	include/forfun/last_stone_weight.hpp
Least recently used (LRU) cache	C++20	src/forfun/lru_cache.cpp
Linked list	C++20	include/forfun/container/list.hpp
List bidirectional iterator	C++20	include/forfun/container/internal/list_iterator.hpp
Maximum subarray	C++20	include/forfun/maximum_subarray.hpp
Meeting rooms	C++20	include/forfun/meeting_rooms.hpp
Move zeroes	C++20	include/forfun/move_zeroes.hpp
Multiples of three or five	C++17	include/forfun/project_euler/p0001_multiples_of_3_or_5.hpp
Nth Fibonacci number	C++20	include/forfun/fibonacci.hpp
Number of ships in a rectangle	C++20	src/forfun/sonar.cpp
Palindrome	C++20	include/forfun/palindrome.hpp
Palindrome (in C)	C90	src/forfun_c/palindrome.c
Palindromic number	C++20	src/forfun/palindromic_number.cpp
Primality test	C++20	include/forfun/primality.hpp
Product of array except self	C++20	include/forfun/product_except_self.hpp
Quicksort	C++20	include/forfun/sorting/quicksort.hpp
Set matrix zeroes	C++17	src/forfun/set_matrix_zeroes.cpp
Subsets	C++20	include/forfun/graph/subsets.hpp
Sums of subarrays of length k	C++20	include/forfun/sub_array_sums.hpp
Top K frequent elements	C++23	include/forfun/top_k_frequent_elements.hpp
Tower of Hanoi	C++20	include/forfun/tower_of_hanoi.hpp
Trie	C++20	include/forfun/trie.hpp
Two sum	C++20	include/forfun/two_sum.hpp
Two-pass Boyer-Moore majority	C++20	include/forfun/majority_element.hpp
Valid anagram	C++20	include/forfun/valid_anagram.hpp
Valid parentheses	C++20	src/forfun/valid_parentheses.cpp

Disclaimer

The provided attempted solutions are not guaranteed to be correct, safe, secure, optimal, or suitable for use in production. The code and coding style may, or may not, follow best practice guidelines.

License

Problem licenses

Problem copyrights are reserved to their respective owners.

Solution licenses

Solution code is released under an MIT-style license. Copyright © Omar Boukli-Hacene. All rights reserved.

SPDX license identifier: MIT.

---

Written for the joy of it 🪐