Extract the real problem from the story. Then write the C++.

Briefings sound like a hiring manager, not a textbook. The editor is the easy part. The skill is hearing the data structure inside the noise.

Read the briefing

Companies do not hand you two-sum. They tell a story. Click the phrases that would change the design. Some of them are traps.

Ask the interviewer what a strong candidate would ask. Write the actual CS problem on the signal board before you type a line of C++.

A real C++ editor: colored keywords, types, functions, STL autocomplete. Then an interviewer grades your reading and your code.

Choose your round and pick a topic to focus your preparation, or select "Surprise Me!" for a completely random simulation.

Tackle a randomized medium or hard problem curated directly from real company datasets.

Select a Topic

Design scalable, object-oriented systems based on classic architectures and real-world apps.

Select a Topic

Paste a Leetcode ID, describe a system (e.g. "Chess LLD"), or paste an interview prompt.