Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Assumptions

  1. You will pick exactly two songs.
  2. You cannot pick the same song twice.
  3. If you have multiple pairs with the same total time, select the pair with the longest song.
  4. There are at least two songs available 
Write an algorithm to find the IDs of two songs whose
combined runtime will finish exactly 30 seconds before the
bus arrives, keeping the original order.
Input
The input to the function/method consists of two
arguments -
rideDuration, an integer representing the duration of the
ride in seconds;
songDurations, a list of integers representing the duration
of the songs.
Output
Return a pair of integers representing the IDs of two songs
whose combined runtime will finish exactly 30 seconds
before the rider reaches their stop. If no such pair is
possible, return a pair with <-1, -1>.
Constraints
0 < songDurations[i] < 1001
Osi< number of songs
Example
Input:
rideDuration
= 90
songDurations = [1, 10, 25, 35, 60]
Output:
[2, 3]
Explanation:
During the ride duration of 90 seconds, the rider listens to
the third and fourth songs (2nd and 3rd index, respectively)
which end exactly 30 seconds before the bus arrives at their
stop.
If two songs have the same duration, select the option with
the lowest index.
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Transcribed Image Text:Write an algorithm to find the IDs of two songs whose combined runtime will finish exactly 30 seconds before the bus arrives, keeping the original order. Input The input to the function/method consists of two arguments - rideDuration, an integer representing the duration of the ride in seconds; songDurations, a list of integers representing the duration of the songs. Output Return a pair of integers representing the IDs of two songs whose combined runtime will finish exactly 30 seconds before the rider reaches their stop. If no such pair is possible, return a pair with <-1, -1>. Constraints 0 < songDurations[i] < 1001 Osi< number of songs Example Input: rideDuration = 90 songDurations = [1, 10, 25, 35, 60] Output: [2, 3] Explanation: During the ride duration of 90 seconds, the rider listens to the third and fourth songs (2nd and 3rd index, respectively) which end exactly 30 seconds before the bus arrives at their stop. If two songs have the same duration, select the option with the lowest index.
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