#Invert

226. Invert Binary Tree

Invertabinarytree.Example:Input:4/27//1369Output:4/72//9631Trivia:ThisproblemwasinspiredbythisoriginaltweetbyMaxHowell:/Google:90%ofourengineersusethesoftwareyo...
代码星球 ·2021-02-08

leetcode 226. Invert Binary Tree

 classSolution{public:TreeNode*invertTree(TreeNode*root){if(root==NULL)returnNULL;TreeNode*tmp=invertTree(root->left);root->left=invertTree(root->...

1102. Invert a Binary Tree (25)

ThefollowingisfromMaxHowell@twitter:Google:90%ofourengineersusethesoftwareyouwrote(Homebrew),butyoucan'tinvertabinarytreeonawhiteboardsofuckoff.Nowit'syourturnt...
代码星球 ·2020-04-08

正排索引(forward index)与倒排索引(inverted index)

正常的索引一般是指关系型数据库里的索引。 把不同的数据存放到不同的字段中。如果要实现baidu或google那种搜索,就需要与一条记录的多个字段进行比对,需要 全表扫描,如果数据量比较大的话,性能就很低。那反过来,如果把mysql中存放在不同字段中字符串,按一定规则拆分成term【词】存放到&nbs...