你可以假设网格地图的四条边都被水域包围。
You may assume all four edges of the grid are all surrounded by water.
针对移动机器人越野环境下地图重建的问题，提出了一种三维网格地图的更新算法。
In order to build a precise 3-d map of outdoor environment, a novel map reconstruction algorithm is proposed based on a mobile robot.
给定一个由字符‘1’(陆地)和‘0’(水域)组成的二维网格地图，计算岛屿的个数。
Given a 2d grid map of '1's (land) and' 0's (water), count the number of islands.
给定一个由字符‘1’(陆地)和‘0’(水域)组成的二维网格地图，计算岛屿的个数。
Given a 2d grid map of '1's (land) and' 0's (water), count the number of islands.
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