Welcome to IanOJ!

Here you can find problems to solve from a variety of sources and contests, and submit your solutions.

This is the only publicly known resource of past problems from the KL Coding Cup.

60/195 problems from the KL Coding Cup have been archived so far.

We currently support submissions in Python 3.9.6, C11 and C++17.

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IMPORTANT:

If you're looking to participate in IanOJ Halloween Challenge 2025, click here.

The Halloween contest uses a completely separate platform from the main IanOJ website.

You need to register for a new account there, even if you already have an account on this website.

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