Leetcode-Question-531: Lonely Pixel I

原文链接:

https://leetcode.com/problems/lonely-pixel-i/

题目描述:


Given a picture consisting of black and white pixels, find the number of black lonely pixels.

The picture is represented by a 2D char array consisting of ‘B’ and ‘W’, which means black and white pixels respectively.

A black lonely pixel is character ‘B’ that located at a specific position where the same row and same column don’t have any other black pixels.

Example:

Note:

  1. The range of width and height of the input 2D array is [1,500].

解析:

 

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