public class Array2D {
	
	public static boolean checkForSquare(int[][] arr , int K , int col , int row)
	{
		if(arr[col][row] == K)
		{
			if(arr[col][row + 1]== K)
			{
				if(arr[col + 1][row]== K)
				{
					if(arr[col + 1][row + 1]== K)
					{
						return true;
					}
				}
			}
		}
			return false;
	}


	public static void main(String[] args)
	{
		int [][] a = {
				{1,2,3,4,4,6,7,12,23,11,13,14},
				{0,8,6,4,4,9,1,657,876,8,345, 555},
				{0,8,6,75,90,9,1,657,876,8,345, 555},
				{1,2,3,6,6,6,7,12,23,11,13,14},
				{0,8,6,6,6,9,1,657,5,8,6, 7},
				{0,8,6,75,90,9,1,657,4,8,9, 8},
				{1,2,3,4,4,6,7,12,29,29,13,16},
				{0,8,6,4,4,9,1,0,29,29,13, 14},
				{0,8,6,0,0,9,1,657,876,8,3, 25},
				{1,2,3,4,4,6,7,12,23,11,13,14},
				{0,8,6,4,4,9,1,0,1,8,0, 1},
				{0,8,6,0,0,9,1,0,2,8,3, 2},
		};
		
		System.out.println(checkForSquare(a, 4, 0, 3)); //checks A
		
		int biggest = 0;					//checks B
		for(int K = 1 ; K <= 30 ; K ++)
			for(int i = 0 ; i < 11 ; i ++)
				for(int j = 0 ; j < 11 ; j ++)
				{
					if(checkForSquare(a, K, i, j))
						if(K > biggest)
							biggest = K;
				}
		System.out.println(biggest);
		
	}

}