Description During the programming classes Vasya was assigned a difficult problem. However, he doesn't know how to code and was unable to find the solution in the Internet, so he asks you to help. You are given a sequence a, consisting of ndistinct i
包含mysql 递归查询父节点 和子节点 mysql递归查询,查父集合,查子集合 查子集合 --drop FUNCTION `getChildList` CREATE FUNCTION `getChildList`(rootId varchar()) RETURNS varchar() BEGIN DECLARE str varchar(); DECLARE cid varchar(); SET str = '$'; SET cid = rootId; WHILE cid is not null
条件节点和行为节点,这两种节点本身的设计比较简单,项目中编写行为树节点一般就是扩展这两种节点,而Decorator和Composite节点只需要使用内置的就足够了. 它们的继承关系如下: Conditional->Task Action->Task 代码如下: BTAction.lua BTAction = BTTask:New(); local this = BTAction; function this:New() local o = {}; setmetatable(o, self);