Meet your coaches
Talk through the problem while you code. Guest text is free. Hosted voice is the Own Words Pack.
Single Number
Single Number looks straightforward, but it quietly checks whether you reach for the right lookup structure. It's a great warm-up that builds data-structure instincts without a ton of moving parts. Watch your edge cases around repeats, and be clear about what your map is storing.
Chat with Fin or Coco right now on mobile.
Start talking through the problem here. Switch to desktop when you're ready to code and run tests.
Start coaching sessionMeet your coaches
Talk through the problem while you code. Guest text is free. Hosted voice is the Own Words Pack.
Start a coached rep now. Guest text is free. Sign in if you want this work on another device.
Email me this coached-rep link
Code + tests need a desktop
Chat works on this phone. Email yourself a link when you want the editor and tests.