Given a matrix of \'.\' and \'#\' where \'#\' denotes the obstacle in the matrix. Find the longest path starting from first row (any cell) of matrix to last row (any cell) of matrix.\nYou can travel left, right and bottom from a particular cell\nEg: \n\n[[\'.\', \'.\']\n[\'.\', \'.\']]\n\nAns = 4\n\nAny ideas how to approach this ?

Given a matrix of \'.\' and \'#\' where \'#\' denotes the obstacle in the matrix. Find the longest path starting from first row (any cell) of matrix to last row