An n x n grid is composed of 1 x 1 squares where each 1 x 1 square consists of a '/' , '\' , or blank space ' ' . These characters divide the square into contiguous regions.
Given the grid grid represented as a string array, return the number of regions .
Note that backslash characters are escaped, so a '\' is represented as '\\' .
n == grid.length == grid[i].length1 <= n <= 30grid[i][j] is either '/' , '\' , or ' ' .