0959. Regions Cut By Slashes
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https://leetcode.com/problems/regions-cut-by-slashes
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 '\\'.
Example 1:
Example 2:
Example 3:
Example 4:
Example 5:
Constraints:
n == grid.length
n == grid[i].length
1 <= n <= 30
grid[i][j] is either '/', '\', or ' '.
