Toll-Booth Log Parsing and Analysis | Dataford Interview Questions

Toll-booth log parser: find and fix the bug where the timestamp is not parsed as a number (missing float), then implement count_journeys() returning the number of complete ENTRY->MAINROAD*->EXIT journeys, and catch_speeders() returning license plates that drove >=130 km/h in any 10km segment or >=120 km/h in any two segments (once per journey). Asked in the Karat - OOD/debugging (30 min) stage. Existing LogEntry/LogFile classes.

For grading, implement analyze_logs(log_entries), returning { "journeys": int, "speeders": list[str] }. Each entry is a dictionary with plate, timestamp, event, and distance_km; timestamps may be numeric strings. Sort records by plate and numeric timestamp. Each consecutive 10 km transition after ENTRY defines one segment, including the final transition to EXIT.

Constraints

1 <= len(log_entries) <= 10^4
Each entry has plate, timestamp, event, and distance_km fields
timestamp may be an integer, float, or numeric string and represents hours
event is one of ENTRY, MAINROAD, or EXIT
Valid consecutive journey records are exactly 10 km apart
A journey must start with ENTRY and end with EXIT
Return each speeding plate at most once

Function Signature

def analyze_logs(log_entries):

Your question is Toll-Booth Log Parsing and Analysis. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Constraints

1 <= len(log_entries) <= 10^4
Each entry has plate, timestamp, event, and distance_km fields
timestamp may be an integer, float, or numeric string and represents hours
event is one of ENTRY, MAINROAD, or EXIT
Valid consecutive journey records are exactly 10 km apart
A journey must start with ENTRY and end with EXIT
Return each speeding plate at most once

Function Signature

def analyze_logs(log_entries):

Your question is Toll-Booth Log Parsing and Analysis. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.