There are two main functions.
■ Online programming
→ The source code can be shared.
→ Various programming languages can be used.

■ Online self-learning programming quiz
→ If you answer the question correctly, you can immediately determine whether it is correct or incorrect.
→ We will increase the number of problems at any time.
→ Ideal for entry into programming contests.

We look forward to your feedback.

■ Online programming site "ryin.me" link
https://ryin.me

Sample source code for each language