How should I practice Validate Server Log Summary Counts?

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Validate Server Log Summary Counts

Google● MediumINTERNONSITE INTERVIEW

Problem statement

A server log is represented by logs. Each row is [timestamp, userId, action]. The rows are unordered, and repeated rows are separate events.

An analytics service returns summary, where each row is [userId, action, reportedCount]. Each user-action pair appears at most once in summary.

The problem statement continues

Pro

Examples

Example 1

logs = [["2026-10-10T10:00:00Z","u1","login"],["2026-10-10T10:03:00Z","u1","logout"],["2026-10-10T10:05:00Z","u1","login"]]summary = [["u1","login","1"],["u1","logout","1"]]return = [["u1","login","2","1"]]

The raw log contains two login events for u1, but the summary reports one.

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