Competitive Programming in Java

This repository contains my solutions, templates, and utilities for competitive programming in Java.

Structure

• src/solutions — Solution code, organized by site/category.
• src/test/ — Unit tests for problems (optional).
• templates/ — Java templates for quick problem setup.
• lib/ — External libraries (e.g., JUnit).
• input/ and output/ — Sample input/output files for local testing.
• pom.xml — Maven build file for dependency management.

Templates

Copy a template from templates/Template.java to start a new problem quickly.

Local I/O testing

1. Configure the following lines at the top of your ProblemName.java file and set LOCAL to true to allow for local testing:

    boolean LOCAL = true;

        BufferedReader br;
        PrintWriter out;

        if (LOCAL) {
            br = new BufferedReader(new FileReader("src/input/problemname.in"));
            out = new PrintWriter(new FileWriter("src/output/problemname.out"));
        } else {
            br = new BufferedReader(new FileReader("problemname.in"));
            out = new PrintWriter(new FileWriter("problemname.out"));
        }

2. Create the problemname.in file in the src/input dir and leave your empty problemname.out file in the src/output

3. Run your problemname.java file and check the problemname.out file for results

JUnit Testing

Prerequisites: Maven installed, Debugger for Java Extension installed (this is a VSCode setup)

1. Create a [problemname]Test.java file inside the src/test/java dir

2. Copy and paste the template from src/main/java/templates/TestTemplate.java and configure it to your liking

3. Run the test using the Testing sidebar or:

mvn test

Usage

1. Clone the repository:

   git clone <repo-url>
   cd competitive-programming

2. Compile a solution:

   javac src/solutions/path/to/ProblemName.java

3. Run a solution:

   java -cp src/main/java path.to.ProblemName

Contributing

Contributions are welcome! Please follow the existing structure and naming conventions. Submit a pull request with your changes.

License

This project is licensed under the MIT License.