Each of the NN following lines contains a string of exactly N characters, representing the barn. The
first character of the last line is cell 1,1. The last character of the first line is cell N, N.Eac
h character will either be an H to represent a haybale or an E to represent an empty square.
It is guaranteed that cells 1,1 and N,N will be empty, and furthermore it is guaranteed that there i
s a path of empty squares from cell 1,1 to cell N,N
On a single line of output, output the length of the shortest sequence of directions that will guide
Bessie to the goal, irrespective whether she starts facing up or right.
In this example, the instructions "Forward, Right, Forward, Forward, Left, Forward, Left, Forward, F
orward" will guide Bessie to the destination irrespective of her starting orientation.
1.“无论Bessie处于左下角时是头朝向上还是朝向左”根据英文原文“Bessie doesn't know if she starts out facing up (towards cell 1,2) or right (towards cell 2,1).”应为无论Bessie处于左下角时是头朝向上还是朝向右
2.漏了原题很重要的一点:"Once she reaches the goal she will ignore further commands."即如果Bessie已经到达终点，她会忽视以后的所有行为