Round free response answer 2025

Round is #3 from the from the 2025 AP Computer Science A Free Response problems.

https://apcentral.collegeboard.org/media/pdf/ap25-frq-computer-science-a.pdf

Part (a) Round constructor

public Round(String[] names)
{
    competitorList = new ArrayList<Competitor>();
    for(int i = 0; i < names.length; i++)
        competitorList.add(new Competitor(names[i], i + 1));
}

Part (b) buildMatches method

public ArrayList<Match> buildMatches()
{
    ArrayList<Match> matches = new ArrayList<Match>();

    int bestIndex = competitorList.size() % 2;
    int worstIndex = competitorList.size() - 1;

    while(bestIndex < worstIndex)
    {
        matches.add(new Match(
                competitorList.get(bestIndex),
                competitorList.get(worstIndex)));

        bestIndex++;
        worstIndex--;
    }

    return matches;
}

Java files with test code

Competitor.java
Match.java
Round.java
ThreeTest.java

See Running JUnit 5 tests.

2025 AP CS Exam Free Response Solutions

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