LeetCode Java Solutions

A collection of Java solutions to LeetCode problems, organized by difficulty, with JUnit tests for each solution.

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📂 Folder Structure

Easy/      → Solutions for Easy problems
Medium/    → Solutions for Medium problems
Hard/      → Solutions for Hard problems
tests/     → JUnit test files for each solution
lib/       → JUnit and Hamcrest libraries

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📝 How to Run Tests Locally

1. Compile solution and test files (from project root):

javac -cp ".;lib/*" Easy/YourSolution.java tests/Easy/YourSolutionTest.java

2. Run the JUnit tests:

java -cp ".;lib/*" org.junit.runner.JUnitCore tests.Easy.YourSolutionTest

Replace YourSolution and YourSolutionTest with the actual file/class names.

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🚀 Example

For the first problem, IntersectionOfTwoArraysII:

Compile:

javac -cp ".;lib/*" Easy/IntersectionOfTwoArraysII.java tests/Easy/IntersectionOfTwoArraysIITest.java

Run Test:

java -cp ".;lib/*" org.junit.runner.JUnitCore tests.Easy.IntersectionOfTwoArraysIITest

All tests should pass if the solution is correct.

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✨ Contributing

1. Add new solutions under the appropriate difficulty folder (Easy/, Medium/, Hard/).
2. Add a matching JUnit test under tests/ with the same package structure.
3. Commit and push your changes to keep the repo updated.

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💡 Notes

• Each solution should be self-contained with proper class and method names.
• Tests use JUnit 4. Make sure lib/junit-4.13.2.jar and lib/hamcrest-core-1.3.jar are present.
• Keep naming consistent for readability and maintainability.

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Happy coding! 🚀