DoorDashCodingMembers
Coding: First Unique Restaurant in a Stream
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DoorDash wrapper around LC 1429, First Unique Number. Support `add(restaurant_id)` and return the earliest restaurant ID that has appeared exactly once, preserving arrival order; follow-ups probe unbo...
SWE
data-structure
streaming
hashmap
linked-list
concurrency
medium
Frequency
Single report
Last asked
2026-08-16
Stage
onsite-coding
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