How should I practice Cumulative 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 Cumulative 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.

Cumulative Flight-Distance Alerts

Skydio● MediumFULLTIMEPHONE SCREEN

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Problem statement

A drone reports planar coordinates in travel order. Starting with the first report, accumulate the Euclidean length of every traveled segment. Whenever the accumulated distance is at least threshold, emit the current zero-based coordinate index and reset the accumulator to zero.

Return all emitted indices in increasing order. Distance left after the final report does not emit an alert.

Function

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

Examples

Example 1

coordinates = [[0.0,0.0],[0.5,0.0],[1.0,0.0],[1.1,0.3],[2.0,1.0]]threshold = 1.0return = [2,4]

The first two segments total one meter. After reset, the final two segments exceed one meter.

Example 2

coordinates = [[0.0,0.0],[0.3,0.4]]threshold = 1.0return = []

The path length is only 0.5 meters.

Constraints

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