How should I practice Babysitter Quote with Hourly Rates?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Upstart onsite interview problems in FastPrep.

Is Babysitter Quote with Hourly Rates associated with Upstart?

FastPrep tags this as a Upstart onsite interview coding practice problem when the problem catalog has that company and stage context.

Babysitter Quote with Hourly Rates

Upstart● MediumFULLTIMEONSITE INTERVIEW

Learn

Problem statement

Calculate a babysitter quote when the hourly pay changes with the time of day.

For this exercise, assume hourlyRates has exactly twenty-four entries. Entry h is the hourly rate in cents for the half-open interval from hour h through hour h + 1. This daily schedule repeats at midnight. The start and end are integer minutes after midnight.

Charge for the half-open interval [startMinute, endMinute). If the end is earlier than the start, the end is on the next day. Equal endpoints mean a zero-length booking, not a full day. Each billed minute contributes one-sixtieth of its hourly rate. Add all exact minute charges, then round the total up to the next whole cent once. Return that integer number of cents.

These time, overnight, proration and rounding rules are explicit practice assumptions; no additional fees, minimum booking or discounts apply.

Function

babysitterQuote(startMinute: int, endMinute: int, hourlyRates: int[]) → int

Examples

Example 1

startMinute = 60endMinute = 120hourlyRates = [1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200,1200]return = 1200

One whole hour at a flat rate.

Example 2

startMinute = 450endMinute = 510hourlyRates = [600,600,600,600,600,600,600,600,1200,1200,1200,1200,1200,1200,1200,1200,1800,1800,1800,1800,1800,1800,1800,1800]return = 900

A quote straddles an hourly rate change.

Example 3

startMinute = 1410endMinute = 30hourlyRates = [600,600,600,600,600,600,600,600,1200,1200,1200,1200,1200,1200,1200,1200,1800,1800,1800,1800,1800,1800,1800,1800]return = 1200

One hour across midnight at different rates.

Constraints

0 <= startMinute, endMinute < 1440.
hourlyRates.length = 24.
0 <= hourlyRates[h] <= 10000 cents per hour.
The booking lasts from zero through 1439 whole minutes.
All weighted sums and the returned quote fit a signed 32-bit integer.