Give a matrix of 1\'s and 0\'s.  For example, matrix = [\n ["1","1","1","1","1"],\n ["1","1","0","0","1"],\n ["1","1","0","0","1"],\n ["1","1","1","1","1"]\n ]\n\nRound 1:  find the rectangle that is made of  0s, either return the start and end index OR  height and length of the rectangle. There is only 1 rectangle in each matrix. I solved it by looping to find the first and last zero.\n\nRound 2: same problem but now the matrix may contains many rectangles.  Return the start and end indexes of each rec in an array.\n\nmatrix = [\n ["0","1","1","1","1"],\n ["1","1","0","0","1"],\n ["0","1","0","0","1"],\n ["0","1","1","1","1"],\n ["1","0","1","1","1"]\n ] => 4 rectangles in here . 0 by itself is also a rectangle, and vertical rectangle also counts.\n\nI told them I would check for the surrounding 1 but I didnt have time to finish the second round. Any insight on how to solve ?  Thank you!\n

Give a matrix of 1\'s and 0\'s.  For example, matrix = [\n ["1","1","1","1","1"],\n ["1","1","0","0","1"],\n ["1","1","0","0","1"],\n ["1","1","1","1","1"]\n ]\