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连通块模板及变式(共4题)
2022-07-02 02:24:00 【gzkeylucky】
知识点:洪水填充算法(floodfill):
1.定义:
从一个起始节点开始,把附近与其连通的节点提取出或填充成不同颜色颜色,直到封闭区域内的所有节点都被处理过为止。是从一个区域中提取若干个连通的点与其他相邻区域区分开(或分别染成不同颜色)的经典算法。因为其思路类似洪水从一个区域扩散到所有能到达的区域而得名。
洪水填充算法接受三个参数:起始节点,目标节点特征和针对提取对象要执行的处理。目前有许多实现方式,基本上都显式的或隐式的使用了队列或者栈。
2.适用范围和实现方式:
该算法常用于求连通块问题 。
洪水填充算法实现最常见有四邻域填充法(不考虑对角线方向的节点),八邻域填充法(考虑对角线方向的节点),基于扫描线填充方法。根据实现又可以分为递归与非递归(基于栈)。
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