Code-block ordering
Arrange input, initialisation, processing, updates, and output into the correct algorithm flow.
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Problem Types
This site does not start with writing full code
You read the statement, choose useful blocks, reject distractors, and arrange a program. Intermediate and hard problems may also include fill-in-code.
Distractor blocks
Distractors are usually almost right, but change a boundary, update, loop order, or output point.
Fill-in-code
Some blocks need a short C++ or Python snippet, so you practise reading context.
Sample running
Samples are not a full proof, but they quickly check input, output, and main logic.
A good routine for each problem
- 1Read the final task paragraph first
- 2Find input and output
- 3Decide which state to maintain
- 4Place required steps before rejecting distractors
- 5Submit, then review feedback