Workspace/The bookshelf

Opening your workspace…

Create a room

01

Room settings

Pick some problems and invite your friends.

Use this name, generate another, or write your own.

Session type

Private link · up to 6 people · expires after 24 hours

02

Pick your problems

Choose up to 6 problems for your session.

22 problems

Find your next challenge

A perfect pairArrays · Hash mapsEasyKeep it togetherStrings · StacksEasyTwo queues, one counterArrays · Two pointersEasySomething differentStrings · Sliding windowMediumIslands in the brewGraphs · Depth-first searchMediumThe long way homeGraphs · Shortest pathsHard
Browse all problems

Welcome to the brewery

HackerBrewery

Welcome to HackerBrewery.

Read the guide to coding rooms

Create a private room and invite up to five friends. Choose a relaxed study session or a timed sprint, then talk through the ideas together. Rooms close after 24 hours.

Share your code when you’re ready, or keep working privately. Sign in to save your practice across devices. Sample checks help you explore an approach; they don’t award competitive rankings.

Make yourself at home

Choose the name other participants will see.

Keep your drafts and progress on every device.

Sign in to save your work