Meet your coaches
Talk through the problem while you code. Guest text is free. Hosted voice is the Own Words Pack.
Serialize and Deserialize Binary Tree
Serialize and Deserialize forces you to pick a format that survives a round trip, and pre-order with null markers is the cleanest pick. The deserialize side is the real test: a shared cursor over your tokens rebuilds the tree in one pass. Get this and you understand why null placeholders are not optional, they are the structure.
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.