FastPrep

Description

Solutions

Submission

Buses in a Bustling Town 🚌

🔥 FULLTIME

In a bustling town where buses shuttle passengers throughout the day, the schedule of bus departures is meticulously recorded. Imagine you're standing at the bus stop, checking the time on your watch. You want to know how long ago the last bus departed. But if the day hasn't started yet and the first bus hasn't left, you're out of luck and receive a signal of -1.

Your task is to determine, from the listed departure times and the current time, how many minutes have passed since the last bus departed. Remember, if a bus is scheduled to leave exactly at the current time, it hasn't departed yet.

Example 1:

Input:  timeTable = ["12:30", "14:00", "19:55"], moment = "14:30"
Output: 30 
Explanation:
The present moment -> "14:30". The very last bus in the town departed at "14:00", so we can return 30 (literally 30 mins ago)

P.S. For original prompt, pls refer to source img.

Example 2:

Input:  timeTable = ["00:00", "14:00", "19:55"], moment = "00:00"
Output: -1 
Explanation:
Unfortunately 😢, there is not buses departed before "00:00" (the bus was supposed to depart at "00:00" hasn't departed yet), so return -1;

P.S. For original prompt, pls refer to source image.

Example 3:

Input:  timeTable = ["12:30", "14:00", "19:55"], moment = "14:00"
Output: 90 
Explanation:
The present moment is "14:00". And the most recent  bus departed at "12:30" (the bus was supposed to go at "14:00" hasn't departed yet), so we return 90.

P.S. For original prompt, pls refer to source image.

Constraints:

Uknown for now