Promptly
← Index
LoungeLeaderboard →

S02 · Distributed Chaos · L-07

Vector Clock

Difficulty
medium
Type
generation
Session
Standard
Stack
Go go1.22
Domain
Distributed
Est. solve
~25 min

01 · The task

Implement a vector clock from scratch against a fixed, closed API: Tick, Merge, and Compare (returning before/after/concurrent/equal). A bounded distributed primitive with unambiguous semantics — the signatures and tests are given.

02 · Constraints

  • Closed API

    Implement against fixed signatures — don't change the public interface.

  • No external dependencies

    Solve it with the standard library only.

03 · Skills exercised

distributed-primitivesSmall building blocks (clocks, registers) that distributed systems compose.causalityTracking happens-before relationships between distributed events.vector-clocksPer-node counters that order events and detect concurrency.

How to playDaemon

The whole level runs through the local promptly daemon — it pulls the workspace, captures your token usage, tests locally, and submits the ranked run.

Full setup guide →Manage devices

  1. Pair this machine

    One-time — approve the code under your devices.

    promptly pair

  2. Pull the workspace

    Downloads the starter kit into the current folder and starts the solve clock.

    promptly init stage-2-07-vector-clock

  3. Start the captured session

    Then drive your AI tool — the daemon meters every prompt and token live.

    promptly start stage-2-07-vector-clock

  4. Submit for ranked grading

    Runs the full hidden suite and ends the attempt.

    promptly submit

Or combine steps 02–03 into one commandShortcut

promptly play pulls the workspace, launches the daemon, and starts the captured session in a single step — the same as running init then start.

promptly play stage-2-07-vector-clock