James Pan

原题网址：https://leetcode.com/problems/smallest-rectangle-enclosing-black-pixels/An image is represented by a binary matrix with 0 as a white pixel and 1 as a black pixel. The black pixels are con

原题网址：https://leetcode.com/problems/surrounded-regions/Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's i