How should I practice Wait Until the Next Shuttle?

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

Is Wait Until the Next Shuttle associated with TikTok?

FastPrep tags this as a TikTok online assessment coding practice problem when the problem catalog has that company and stage context.

Wait Until the Next Shuttle

TikTok● EasyFULLTIMEOA

Learn

Problem statement

A theme park runs shuttles on a daily timetable. You are given shuttle_times, sorted in chronological order, and the current time current_time. Every time uses the 24-hour format HH:MM.

Find the earliest shuttle that has not left. A departure earlier than current_time has already left. For this exercise, assume a departure exactly at current_time is still available.

Return the waiting time as a string in HH:MM format, with two digits for both hours and minutes. If no shuttle remains today, return the string "-1". Do not wait for service on the next day.

For this exercise, assume the timetable may be empty and may contain duplicate departure times.

Function

nextShuttleWait(shuttle_times: String[], current_time: String) → String

Examples

Example 1

shuttle_times = ["12:30","14:00","19:55"]current_time = "14:30"return = "05:25"

The departures at 12:30 and 14:00 have already left. The next is 19:55. The difference from 14:30 is 325 minutes, or 05:25.

Example 2

shuttle_times = ["12:30","14:00","19:55"]current_time = "20:00"return = "-1"

At 20:00, every listed shuttle has already left. Return "-1".

Example 3

shuttle_times = ["12:30","14:00","19:55"]current_time = "14:00"return = "00:00"

The shuttle at 14:00 leaves at the current time and is still available. The wait is 00:00.

Constraints

For this exercise, assume 0 <= shuttle_times.length <=1440.
Every time string has exactly 5 characters in the form HH:MM.
The hour is from 00 through 23, and the minute is from 00 through 59.
shuttle_times is sorted in nondecreasing chronological order.