How should I practice Detect Security Attacks from Network Logs?

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

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Detect Security Attacks from Network Logs

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Problem statement

You are given network log records in the form "timestamp sourceIp destinationIp", where timestamps are integer seconds. The records may be unsorted.

A source IP is flagged when it contacts more than ten distinct destination IPs within any inclusive 600-second window. Return every flagged source IP exactly once in lexicographic order.

Only this disclosed detection rule is in scope.

Function

detectAttacks(logs: String[]) → String[]

Examples

Example 1

logs = ["0 a d0","30 a d1","60 a d2","90 a d3","120 a d4","150 a d5","180 a d6","210 a d7","240 a d8","270 a d9","600 a d10"]return = ["a"]

Source a reaches eleven distinct destinations from time 0 through 600, including both endpoints.

Example 2

logs = ["0 a x","10 a x","20 a y","700 a z"]return = []

Repeated requests to the same destination count once per window, and no window contains eleven destinations.

Constraints

1 <= logs.length <= 200000
Each record contains a nonnegative timestamp and two nonempty whitespace-free IP strings.
Timestamps fit signed 32-bit integers.