Questions & Tests for

Victorian Certificate of Education
Algorithmics

2017 – 2022

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In diving competitions, divers receive scores out of ten from seven judges for each dive. Each dive is also attributed a degree of difficulty which is a number ranging from 1.2 to 3.8 (inclusive) in one-tenth increments. For example, upon completion of a 2.5 degree difficulty dive, a diver may achieve the following scores: 5.5, 7.5, 5.5, 7.5, 6.5, 5.0, 7.0 These scores are then used to calculate a single final score as follows: - Bubble Sort is applied to the unordered scores to arrange the sequence from lowest to highest: 5.0, 5.5, 5.5, 6.5, 7.0, 7.5, 7.5 - The two lowest / highest scores are disregarded, leaving exactly three scores: 5.5, 6.5, 7.0 (Note: at most two values from each extremity are disregarded, meaning that some equally low/high values may be retained) - The remaining three scores are added together: 5.5 + 6.5 + 7.0 = 19 - Finally, the total is multiplied by the degree of difficulty of the dive to arrive at the final dive score: 19 × 2.5 = 47.5
(a).
Show the result of only the first and second iterations of Bubble sort on the unordered sequence of scores: 5.5, 7.5, 5.5, 7.5, 6.5, 5.0, 7.0
[2]
(b).
Given an array called SCORES containing 7 scores already sorted from lowest to highest as well as a corresponding diving difficulty score called DD, write pseudocode to output the final score.
[3]
An association of professional diving clubs has decided to move their historic diving competition records from a simple spreadsheet into a more sophisticated electronic database solution. Future diving competition results will be entered directly into the new database. The association wishes the new database to accomodate data from affiliated non-diving groups such as swimming clubs. Furthermore, in an effort to more readily share their data with a variety of external organisations worldwide, the association plans to expose their database to the web via a secure API. Consultants hired to implement an appropriate solution for the diving association have differing views - while some suggest a relational database solution, others recommend an object-oriented one.
(c).
Evaluate the use of an object-oriented database as opposed to a relational database for handling the association's data management requirements.
[6]
(d).
With respect to populating the dive association's new database from the old spreadsheets, explain the need for both data validation as well as data verification in an effort to preserve data integrity.
[6]
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