How should I practice Summarize the Latest Event for Each Device?

Start by reading the full statement, solve the visible examples, then compare the pattern against related OneTrust phone screen problems in FastPrep.

Is Summarize the Latest Event for Each Device associated with OneTrust?

FastPrep tags this as a OneTrust phone screen coding practice problem when the problem catalog has that company and stage context.

Summarize the Latest Event for Each Device

OneTrust● EasyFULLTIMEPHONE SCREEN

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Problem statement

Each device event is [eventId, deviceId, status, timestamp], where the timestamp is a nonnegative decimal integer.

Return one row [deviceId, latestStatus, latestTimestamp, eventCount] per device. Preserve the order in which device IDs first appear. A later input event wins when timestamps tie, and the input must not be mutated.

Function

summarizeByDevice(events: String[][]) → String[][]

Examples

Example 1

events = [["e1","d1","online","10"],["e2","d2","offline","8"],["e3","d1","offline","14"]]return = [["d1","offline","14","2"],["d2","offline","8","1"]]

Device d1 uses its later event and has two total events.

Example 2

events = [["a","x","online","5"],["b","x","offline","5"]]return = [["x","offline","5","2"]]

The later input wins a timestamp tie.

Example 3

events = []return = []

No events produce no summaries.

Constraints

0 <= events.length <= 100000.
Status is online or offline.
Timestamps fit in a signed 64-bit integer.