algoblazerEarly Access

Practice the questions companies asked this week.

Interview reports become clean, fully validated problems within days — around sixty test cases and reference solutions in six languages before anything ships. You solve them in live rooms, alongside everyone else working the same one.

Start solving or browse the problems first

How a report becomes a problem

Fresh doesn’t mean unfinished. Nothing goes live until it passes in all six languages.

Scanned, then read by a person

We watch interview forums for new reports every few hours. A person reads every candidate and drops the ones too vague to author.

Restated, not republished

Each report is rewritten as a clean problem with its own framing: the same algorithmic core, none of the original wording.

Validated the hard way

Around sixty machine-checked test cases, plus reference solutions in Python, JavaScript, Java, C++, Go, and Rust. If it doesn't pass in all six, it doesn't ship.

Promoted by the people who solve it

Community Beta

New problems arrive as Community Beta. Solvers decide whether one graduates to stable, and a vote only counts after a real attempt.

From report posted to solvable: usually a few days.

Core through Gold

Four tiers, so the catalog keeps working after the standard patterns stop being hard.

CoreThe standard algorithms, implemented cold.

BronzeA twist on a classic — enough to break a memorized solution.

SilverNeeds a real insight before any code makes sense.

GoldThe hardest ones we have. These are the ones people argue about in chat.

dockyard-crate-split.pybronze3 in this room

def minHeaviestCrate(crates, maxLifts):
    lo, hi = 1, max(crates)
    while lo < hi:
        mid = (lo + hi) // 2
        lifts = sum((v - 1) // mid for v in crates)
        if lifts <= maxLifts:
            hi = mid
        else:
            lo = mid + 1
    return lo

dev_kofi passed all tests · just now

✓ 3/3 sample tests passed · 41ms

mara: is this just binary search on the answer?

dev_kofi: yes. don’t overthink it 😅

Every problem is a room

Open one and you’re not alone in it — chat down the side, a roster of who’s on it right now, and a feed of submissions as they land, including the ones that fail. Lurking is allowed.

Chat: Ask the question you’d never ask an interviewer.
Roster: See who’s in the room and what language they’re in.
Feed: Every submission as it resolves, passed or not.

Bring people with you

None of it is single-player unless you want it to be.

Watch someone actually code

One click opens anyone’s editor read-only: their code, their cursor, every keystroke, live. Don’t want an audience? One toggle turns it off.

Study groups

A shared problem set, a countdown, and an invite code to send your friends. Live leaderboard while it runs, a podium when it ends, and a rematch button.

Follows and the daily

Follow people and their solves show up in your feed. One daily challenge for everyone, one global leaderboard, and a profile that keeps the receipts.

The next batch of reports is already in triage.

We’re in early access: the catalog grows every week, and some hours the rooms are quiet. You’ll be early either way.