public class Crossword {

	/** Each element is a Square object with a color
	 * (black or white) and a number.
	 * puzzle[r][c] represents the square in row r, column c.
	 * There is at least one row in the puzzle;
	 */
	private Square[][] puzzle;
	
	/** Constructs a crossword puzzle grid.
	 * Precondition: There is at least one row in blackSquares.
	 * Postcondition:
	 *  - the crossword puzzle grid has the same dimensions as blackSquares.
	 *  - the Square object at row r, column c in the crossword puzzle is
	 *    black if and only if blackSquares[r][c] is true;
	 *  - the squares in the puzzle are labeled according to the crossword
	 *    labeling rule
	 */
	public Crossword(boolean[][] blackSquares) {
		/* to be implemented in part (b) */
	}
	
	/**
	 * Returns "true" if the square at row "r", column "c" should be labeled
	 * with a positive number; false otherwise
	 * The square at row "r", column "c" is black if and only if
	 * "blackSquares[r][c]" is "true".
	 * Precondition: "r" and "c" are valid indexes in "blackSquares".
	 */
	public boolean toBeLabeled(int r, int c, boolean[][] blackSquares) {
		/* to be implemented in part (a) */
	}
	
	public String toString() {
		String s = "";
		for(Square[] row : this.puzzle) {
			for(Square sq : row) {
				s += " " + sq.toString();
			}
			s += "\n";
		}
		return s;
	}
}