​LeetCode刷题实战200：岛屿数量

算法的重要性，我就不多说了吧，想去大厂，就必须要经过基础知识和业务逻辑面试+算法面试。所以，为了提高大家的算法能力，这个公众号后续每天带大家做一道算法题，题目就从LeetCode上面选 ！今天和大家聊的问题叫做 岛屿数量，我们先来看题面：https://leetcode-cn.com/problems/number-of-islands/Given an m x n 2d grid map of '1's (land) and '0's (water), return the number of islands.An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water.题意给你一个由 '1'（陆地）和 '0'（水）组成的的二维网格，请你计算网格中岛屿的数量。岛屿总是被水包围，并且每座岛屿只能由水平方向和/或竖直方向上相邻的陆地连接形成。此外 ………………………………