Robot Status Message Deduplication Window

Process timestamped robot messages and display a message only when it has not been displayed within the prior 10 seconds. Hidden arrivals do not refresh the last-displayed timestamp, and the exact 10-second boundary must be clarified. Requirements Process a stream of (time, message) status events from a robot. If the same message was displayed within the past 10 seconds, hide the new event. Otherwise display it and update that message's last-displayed time. Track the last time each message was displayed, not the last time it was received. A hidden duplicate must not refresh the window. Clarify whether an event exactly 10 seconds after the prior display is allowed: the comparison may be > 10 or >= 10. Examples time=10, message="solar panel activated" -> show time=13, message="solar panel activated" -> hide time=21, message="solar panel activated" -> show The event at 21 compares against the display at 10, not the hidden arrival at 13. Notes The state transition occurs only on a displayed event. Updating on every receipt changes the semantics and can suppress a frequently repeated message forever. Resolve the exact-boundary rule before coding and make the comparison match that contract. Preparation Implement the stream processor with per-message state, then trace repeated and interleaved messages by hand. Write tests for the first occurrence, an event just inside the window, exactly at the boundary, just outside it, and a hidden event followed by an allowed display.