Terms of use

Elo Street (elostreet.com) is a free educational site with practice problems for quant researcher interviews. By using it you agree to these terms.

Last updated: 14 November 2026.

Educational use only

The problems, hints and solutions are for practice. They are not financial, investment or career advice. Nothing here promises that you will pass an interview or get a job. Elo Street is not affiliated with any firm that asks similar questions.

Every answer is checked by an automated test, but mistakes can still happen. If you find one, write to us (see Contact) and we will correct it.

Accounts

An account is optional. It keeps your progress and daily streak on all your devices and puts your streak on the leaderboard. Keep your sign-in details to yourself: you are responsible for activity on your account.

Usernames must not impersonate someone else or be offensive. We may rename or remove accounts that break this rule.

You can delete your account at any time from the account page, and everything stored with it is deleted (see the privacy policy).

Fair play

The leaderboard ranks daily streaks. A day counts when you solve the problem of the day on that day, before opening its solution.

• Do not use scripts, bots or other software to send answers or streak data to the service.
• Do not try to tamper with the site, the database or other players' accounts.
• Do not create several accounts to manipulate the leaderboard.

We may remove results, reset streaks or suspend accounts when we see cheating or abuse.

Content

The problem statements, hints, solutions and the code of the site were written for Elo Street. You can read, solve and share links to them freely, and use them for your own study. Please do not copy the problem set in bulk, republish it, or collect it automatically to build another product.

Some problems are built on classic ideas and well-known interview questions, since mathematical ideas belong to nobody. The text is our own.

The service

The site is provided free and “as is”, without warranty. Features may change, and the service may be interrupted or stopped. To the extent the law allows, we are not liable for any loss arising from its use.

Changes

If these terms change, the new version will be posted on this page with a new date.

Contact

Questions about these terms: [email protected].