How should I practice Rolling Five-Second Flight-Distance Alerts?

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

Is Rolling Five-Second Flight-Distance Alerts associated with Skydio?

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

Rolling Five-Second Flight-Distance Alerts

Skydio● MediumFULLTIMEPHONE SCREEN

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Problem statement

A drone reports one planar coordinate at each integer second. For every report index i > 0, compute the path length traveled during the most recent five seconds: sum the adjacent-segment lengths whose ending indices are from max(1, i - 4) through i.

Return every zero-based index where that rolling distance is at least threshold.

Function

rollingDistanceAlerts(coordinates: double[][], threshold: double) → int[]

Examples

Example 1

coordinates = [[0.0,0.0],[0.3,0.0],[0.6,0.0],[0.9,0.0],[1.2,0.0],[1.5,0.0]]threshold = 1.0return = [4,5]

At indices 4 and 5, the most recent four segments total 1.2 meters.

Example 2

coordinates = [[0.0,0.0],[0.1,0.0],[0.2,0.0]]threshold = 1.0return = []

No rolling window reaches one meter.

Constraints

1 <= coordinates.length <= 100000.
Every coordinate has exactly two finite values.
0 < threshold <= 1000000000.