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M2 · Bit Manipulation Under Time
10:00 on the clock
The clock is the server's. It starts when you press start, survives a reload, and answers after it are refused.
No hints, no autocomplete
The editor has completion, suggestions and hover docs off. You can run your code against the samples as often as you like.
Debrief afterwards
When it ends you get the answer, the reasoning, and where the curriculum teaches it.