AmazonCoding·30 minMembers
Earliest One-Time Visiting User
Members only
Build a structure that ingests user logins and can return the earliest-logged user who has visited exactly once. Follow-up generalizes to the top-X earliest one-time visitors.
SWE
hashmap
data-structure
oop-design
medium
Frequency
Low
Last asked
2026-04-15
Stage
onsite-coding
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