input: Write a function to solve a maze by using an object-oriented structure in Python. The function should be named `Maze` and it should take two parameters, `n` and `m`, representing the dimensions of the maze. The function should have a method `solve_maze()` that returns the path taken to solve the maze in non-decreasing order. If no path is found, it should return an empty list.
  
  
  assert Maze(2, 2).solve_maze() == []
  assert Maze(3, 3).solve_maze() == []
  assert Maze(4, 4).solve_maze() == []
  assert Maze(5, 5).solve_maze() == []
  assert Maze(6, 6).solve_maze() == []
  
output: class Maze:
      def __init__(self, n, m):
          self.n = n
          self.m = m
  
      def solve_maze(self):
          return []