Online coding assessments: format and Java setup
40 min · Intermediate
An online coding assessment gives you a problem, you write a program that reads input and prints output, and a computer called a judge runs it on test cases and compares your output with the expected one. Nobody reads your code at this stage: only exact, correct output within the time limit earns marks.
Topics in this lesson
- Anatomy of a coding problem
- Reading input in Java: Scanner and BufferedReader
- Printing exactly the expected output
- Verdicts: accepted, wrong answer, time limit, errors
- Reading constraints to pick the complexity
Interview questions this lesson answers
- What are hidden test cases, and why do they matter?
- Scanner or BufferedReader for a coding round?
- What would you check first after a wrong answer verdict?
- What would you do after a time limit exceeded verdict?
- Why should you never print a prompt like Enter n in a coding round?
- How do you choose an approach from the constraints?
- Why might code that runs on your laptop fail to compile on the platform?
- What is the difference between the input format and the constraints?
- Why should you test with your own inputs before submitting?
- What is the int range in Java, and why does it matter in coding rounds?
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