Demo Review Queue

This is a read-only demonstration using synthetic practices and fabricated progress. The local application additionally supports question entry, editor launching, live attempts, mistake recording, and review scheduling.

Spaced review keeps solved problems from quietly evaporating. Each completed practice has a next_review date; when the date arrives it shows up here and in python tools/review.py due.

Due today

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This page reflects the progress file at the time the site was last built. For a live answer, the command line is authoritative: python tools/review.py due.

How reviewing works

1. Open a due practice and re-attempt it without opening the solution.
2. Use the review questions at the bottom of the page as a self-test.
3. Record how it went:

python tools/review.py complete <id> --rating good

The schedule

The scheduler is deliberately simple — four ratings, transparent arithmetic, stored as plain YAML in progress/progress.yml:

Rating	Meaning	Next review
again	Could not do it without the solution	tomorrow (interval resets to 1 day)
hard	Solved, but slowly or with hints	in 3 days
good	Solved comfortably	in 7 days, or double the previous interval if that is longer
easy	Trivial; over-learned	in 21 days, or double the previous interval if that is longer

Intervals are capped at 90 days so nothing disappears forever. That is the entire algorithm — no hidden ease factors. If you outgrow it, the progress file is plain YAML and easy to migrate.