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959. Regions Cut By Slashes (Medium)
In a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, \, or blank space. These characters divide the square into contiguous regions.
(Note that backslash characters are escaped, so a \ is represented as "\\".)
Return the number of regions.
Example 1:
Input: [ " /", "/ " ] Output: 2 Explanation: The 2x2 grid is as follows:
Example 2:
Input: [ " /", " " ] Output: 1 Explanation: The 2x2 grid is as follows:
Example 3:
Input: [ "\\/", "/\\" ] Output: 4 Explanation: (Recall that because \ characters are escaped, "\\/" refers to \/, and "/\\" refers to /\.) The 2x2 grid is as follows:
Example 4:
Input: [ "/\\", "\\/" ] Output: 5 Explanation: (Recall that because \ characters are escaped, "/\\" refers to /\, and "\\/" refers to \/.) The 2x2 grid is as follows:
Example 5:
Input: [ "//", "/ " ] Output: 3 Explanation: The 2x2 grid is as follows:
Note:
1 <= grid.length == grid[0].length <= 30grid[i][j]is either'/','\', or' '.
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