How should I practice Dasher Pay with Store Waits and Peak Hours?

Start by reading the full statement, solve the visible examples, then compare the pattern against related DoorDash online assessment problems in FastPrep.

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Problem · Hash Table

Dasher Pay with Store Waits and Peak Hours

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DoorDashFULLTIMEOA

Problem statement

A Dasher earns $0.30 per minute for each active delivery. A delivery becomes active when it is accepted and stops being active when it is fulfilled. Therefore, ordinary concurrent-delivery time is paid at activeDeliveries * $0.30 per minute.

Each string in events has the form HH:MM EVENT orderId, where EVENT is ACCEPT, ARRIVE, PICKUP, or FULFILL. Events are in strictly increasing time order and describe valid order lifecycles.

An ARRIVE event begins a store-wait interval for that order, and its matching PICKUP ends the interval. While the Dasher is waiting at a store, only the order being waited on contributes pay; other active orders do not contribute during that interval. Outside a store wait, every active order contributes normally.

Each string in peakHours has the form start end. A peak window is half-open: it includes start and excludes end. Pay earned during a peak window is doubled. Peak windows do not overlap.

Return the total pay in dollars after processing all events.

Function

calculateDasherPay(events: String[], peakHours: String[]) → double

Examples

Example 1

events = ["06:15 ACCEPT A","06:18 ACCEPT B","06:36 FULFILL A","06:45 FULFILL B"]peakHours = []return = 14.4

Pay is 3 * 0.30 = 0.90, then 18 * 0.60 = 10.80 while two deliveries overlap, then 9 * 0.30 = 2.70. The total is $14.40.

Example 2

events = ["06:15 ACCEPT A","06:18 ACCEPT B","06:19 ARRIVE A","06:22 PICKUP A","06:30 ARRIVE B","06:33 PICKUP B","06:36 FULFILL A","06:45 FULFILL B"]peakHours = []return = 12.6

During 06:19-06:22 only order A contributes, and during 06:30-06:33 only order B contributes. All other intervals use the number of active deliveries, giving $12.60.

Example 3

events = ["06:15 ACCEPT A","06:18 ACCEPT B","06:19 ARRIVE A","06:22 PICKUP A","06:30 ARRIVE B","06:33 PICKUP B","06:36 FULFILL A","06:45 FULFILL B"]peakHours = ["06:20 06:30"]return = 18.0

The ordinary total is $12.60. The base pay earned from 06:20 through 06:30 is $5.40, and peak time pays that amount once more, for $18.00.

Constraints

2 <= events.length <= 1000
0 <= peakHours.length <= 100
All times use valid same-day 24-hour HH:MM notation.
Events are in strictly increasing timestamp order.
Every order has one ACCEPT before its optional ARRIVE and PICKUP pair and one later FULFILL.
All accepted orders are fulfilled by the final event.
At most one store-wait interval is active at a time.
Peak windows are valid, half-open, and non-overlapping.