Expense Ledger
mediumMulti-file Python Guided available Pro
A premium two-module challenge. Parse a freeform ledger of signed transactions, then compute each person's net balance against a real pytest suite.
Choose how you want to solve it
Both modes open the same in-browser IDE with the AI pair programmer and the real test suite.
Recommended
Guided Walkthrough
A phase-by-phase interview simulation with instant feedback on your reasoning.
- Explain decisions by voice or text
- Focused, phase-scoped test runs
- Progressive hints when stuck
- Full solution walkthrough at the end
Sandbox
The open coding view. No phases, just you and the codebase.
- Full instructions up front
- Free-form AI pair-programmer
- Run the entire test suite anytime
This problem requires a paid plan. You can preview the statement for free.