Yes, I can think of a case where how it may be used to solve some problems on a M x N grid, where in you could move in either directions top-left to bottom-righ

Yes, I can think of a case where how it may be used to solve some problems on a M x N grid, where in you could move in either directions top-left to bottom-right Or vice-versa. I perhaps used smaller where subproblem may be a more optimal use.