The problem being contributed must either be a simple **file** (**Eg.** [`kruskal-algorithm.cpp`](./algorithms/CPlusPlus/Graphs/kruskal-algorithm.cpp), [`linear-search.java`](./algorithms/Java/searching/linear-search.java)) or a more complex **directory** ([`palindrome/`](./algorithms/Rust/strings/palindrome)). This is a unit `problem`.
The directory tree has the following convention of `algorithms/{language}/{category}/{problem}`, where `{language}` represents the language code of the problem (**Eg.** `CPlusPlus` for C++, `CSharp` for C# etc.), `{category}` is the topic or category of the problem being contributed (**Eg.** `strings`, `sorting`, `linked-lists` etc.), and `{problem}` is a conforming name to the problem (**Eg.** `linear-search.cpp`, `palindrome`, `queue-linked-list.cpp` etc.)
1. Create a new folder and an index for it inside (a readme, `README.md` file).
2. To each new index file, write the readme with your `problem` in it ([Markdown Documentation](https://guides.github.com/features/mastering-markdown/)).
3. The folder name can also only contain **lowercase characters** and **dashes** or **hyphens** (`-`) (Eg. `strings``sorting` etc.)
The file should conform to the `problem` specification, and the extension (**Eg.** `linear-search.java`, `kruskal-algorithm.cpp`, `count-inversions.js` etc.)
The source code files, should either be in `src/` folder (**Eg.** `src/main.cpp` or `src/main.js`) or the root folder (**Eg.** `palindrome.go` or `App.java`) where `ext` is the file extension for the specific programming language.
Again, the source codes must conform to a valid file structure convention that the programming language enforces.