Leetcode: Number of Islands
DFS的Flood Fill方法， 不使用额外visited数组，但是用‘1’变成‘2’表示visited的方法 复杂度 时间 O(NM) 空间 O(max(N,M)) 递归栈空间 ...
原文：[LeetCode] Number of Islands
Given a d grid map of s land and s water , count 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 ...
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