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One part of the problem is the input. By reading in hours and minutes, make a function that converts hours and minutes to minutes past 9:00. To output, hours is seconds divided by 60, and seconds is second mod 60. This makes the rest of the problem easier.
Store the latest ending time of a meeting so far (initialize to 9:00) and override as necessary. Keep a variable for the amount of wasted time (in seconds). If the current meeting’s start time is after the latest ending time, then add the difference to the wasted time.
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