Computer science
Reason about the algorithm before you type it.
the shape of this subject
CS is where copy-paste damage is invisible until the interview. Brainback insists on the invariant, the complexity, and the base case — before any code.
Because computer science rewards the students who do the reps — and punishes the ones who outsource them.
- discipline
- STEM
- typical weekly load
- 3-6 problem sets · 3-5 hours · 1-2 recall sessions
- covered on plan
- all plans (free forever)
Every computer science concept Brainback covers.
Add Computer science as a Learn subject and every problem in these areas routes to the Socratic tutor — attempt-first, hint-laddered, output-guarded.
What one turn in computer science actually looks like.
Attempt → correction → guiding question. No answer. Ever. Verbatim from a beta session.
Two pointers, one at each end, moving inward while sum ≠ target…
What's the invariant your loop maintains?
no answer · one guiding question · your next move
How real attempts start. How Brainback nudges.
- Two pointers, one at each end, moving inward while sum ≠ target…
- What's the invariant your loop maintains?
the anti-pattern
What computer science looks like when the AI does the thinking.
Answer machines make computer science look like a solved problem. It isn't. The exam room reveals whose reasoning was built and whose was rented.
- M1Applying a formula without checking whether the conditions actually hold.
- M2Skipping the sanity check — 'does the sign / magnitude make sense?'
- M3Memorizing steps instead of reasoning about why they're legal.
- M4Reading past the setup and diving straight into computation.
the recall card
What a spaced-repetition card looks like in computer science.
Every wrong attempt and low-scored explain-back becomes a card. SM-2 schedules them — the tricky ones come back tomorrow, the solid ones drift out to next week, then next month.
Recall the core concept in your own words. Then apply it to a fresh example under 2 minutes.
Sub-subjects Brainback tracks separately.
Each has its own hint patterns and recall queue — because 'chemistry' isn't the same rep as 'organic chemistry.'
Related subjects.
The subject where the shortcut has always been most expensive.
Limits, rates, and shapes of change — earned, not delivered.
Where symbolic manipulation becomes second nature — or doesn't.
See the diagram. Not just look at it.
Unit circle, but also unit intuition.
Vectors are directions, not numbers.
computer science — ready when you are
Start your first computer science session.
Attempt-first. Never the answer. Add it as a Learn subject in 30 seconds.