Developing Procedures · AP Computer Science Principles

AP Computer Science Principles Quiz

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ALGORITHMS AND PROGRAMMING

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Based on the scenario, a classroom tool merges two lists of student IDs. Input: list a and list b, each containing integers (IDs may repeat across lists). Output: a new list containing all IDs from a followed by all IDs from b. Constraints: do not change a or b; preserve order within each list; AP-style pseudocode. A student writes:

PROCEDURE MergeLists(a, b)
  merged <- a
  FOR EACH id IN b
    APPEND(a, id)
  RETURN merged

Which step is necessary to ensure the procedure works correctly?

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