摘要：
Leetcode 1254. Number of Closed Islands Given a 2D grid consists of 0s (land) and 1s (water). An island is a maximal 4 directionally connected group o 阅读全文
摘要：
Leetcode 200. Number of Islands Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and 阅读全文