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Practice coding interviews out loud with real-time voice coaching. Your code actually runs.
Minimum Interval to Include Each Query
Binary search is the tool here, but the real test is whether your invariant stays crisp. It's a hard one for a reason: it stresses boundary precision when the rules pile up. Interviewers care more about airtight boundaries than speed here.
Meet Allison & Tim
Your AI coaches
Practice coding interviews out loud with real-time voice coaching. Your code actually runs.
Desktop required to run this problem
StrongYes runs real code + tests in a desktop editor. Mobile is view-only for now, so you can’t start this here. Sorry about that — email yourself a link and pick it up on your computer.
Desktop required
Sorry — mobile can’t run the editor + tests yet. Email yourself a link to continue on desktop.