//q1.a answer - class header and attributes
public class Matrix {
	private int[][] mtrx;
	private int n1;
	private int n2;


	/*
	 * q1.a.1 answer - inner method
	 * Checks if two Matrix objects are the same
	 */
	public boolean isSame(Matrix obj) {
		//condition to checks the equality of the numbers and the length of the 2d-array lengths
		if(this.n1 != obj.getN1() || this.n2 != obj.getN2() ||
				this.mtrx.length != obj.getMtrx().length || this.mtrx[0].length != obj.getMtrx()[0].length)
			return false;
		//loop to checks the values inside the 2d-arrays
		for (int i = 0; i < this.mtrx.length; i++) {
			for (int j = 0; j < this.mtrx[i].length; j++) {
				if(this.mtrx[i][j] != obj.getMtrx()[i][j])
					return false;
			}
		}
		return true;
	}	//end of method


	/*
	 * q1.a.2 answer - returns the numbers of the rows that n1 and n2 appears in them
	 */
	public int appearsInside() {
		boolean found_n1, found_n2;
		int count_rows=0;

		for (int i = 0; i < this.mtrx.length; i++) {
			found_n1 = false;
			found_n2 = false;
			for (int j = 0; j < this.mtrx[i].length; j++) {
				if(this.mtrx[i][j] == this.n1)
					found_n1 = true;
				if(this.mtrx[i][j] == this.n2)
					found_n2 = true;
			}
			if(found_n1 && found_n2)
				count_rows++;
		}
		return count_rows;
	}	//end of method

	/*
	 * q1.a.3 answer - receives k
	 * looks for inner 2d-array that keeps the question criteria
	 */
	/*
	 * 	int[][] m1_nums = { {1,2,2,3},
							{5,4,3,0},
							{3,0,1,7},
							{7,7,1,3}};
	 */
	public boolean look_4_KxK(int k) {
		for (int i = 0; i < this.mtrx.length-k ; i++) {
			for (int j = 0; j < this.mtrx[i].length-k; j++) {
				if( (this.mtrx[i][j] == this.n1) && (this.mtrx[i+k][j+k] == this.n2))
					return true;
			}
		}
		return false;

	}

	//constructor and getters/setters methods - added for compiling purpose only
	public Matrix(int[][] m, int n1, int n2) {
		this.mtrx = m;
		this.n1 = n1;
		this.n2 = n2;
	}

	public int[][] getMtrx() {
		return mtrx;
	}


	public void setMtrx(int[][] mtrx) {
		this.mtrx = mtrx;
	}



	public int getN1() {
		return n1;
	}



	public void setN1(int n1) {
		this.n1 = n1;
	}



	public int getN2() {
		return n2;
	}



	public void setN2(int n2) {
		this.n2 = n2;
	}





}