TileGame free response answer 2009

The TileGame problem from the 2009 AP Computer Science Exam is typical of free response problems that test lists. The problem requires you to manipulate a List and the objects inside.

TileGame is #4 from the 2009 AP Computer Science Free Response.

https://secure-media.collegeboard.org/apc/ap09_frq_computer_science_a.pdf

Part (a) getIndexForFit method

private int getIndexForFit(NumberTile tile)
{
    if (board.size() == 0 || tile.getRight() == board.get(0).getLeft())
        return 0;

    if (tile.getLeft() == board.get(board.size() - 1).getRight())
        return board.size();

    for(int i = 1; i < board.size(); i++)
        if(board.get(i - 1).getRight() == tile.getLeft() &&
                board.get(i).getLeft() == tile.getRight())
            return i;

    return -1;
}

Part (b) insertTile method

public boolean insertTile(NumberTile tile)
{
    for (int r = 1; r <= 4; r++)
    {
        int index = getIndexForFit(tile);
        if (index != -1)
        {
            board.add(index, tile);
            return true;
        }
        
        tile.rotate();
    }

    return false;
}

2009 AP CS Exam Free Response Solutions

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