Write a C++ program to find the minimum number of moves required to reach the exit cell.

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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There is a board of NxM size. Each cell of the board is either
(a) ‘x’ : the cell is blocked
(b) ‘o’ : the cell is free

(c) ‘s’ : starting cell
(d) ‘e’ : exit cell
Starting and ending cells are also considered free.
There is a knight (a chess piece) on the board occupying the start cell.Write a C++ program to find the minimum number of moves required to reach the exit cell.

Sample Input 
4 4
oxox 
sxoe
ooxo
oooo

Sample Output

3

Explanation:
The first line contains N, M.
Here N = 4, M = 4

The optimal movements of the knight are shown in the following,
oxox oxox oxox oxox
sxoe → sxoe → sxoe → sxoe
ooxo ooxo ooxo ooxo
oooo oooo oooo oooo

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