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LeetCode:Binary Tree Zigzag Level Order Traversal
本题也属于层次遍历的变形,不同之处在于其遍历的方法是交替进行的,形成一个ZigZag的曲线形式,如下:代码如下: 1 struct TreeNode { 2 int val; 3 TreeNode* left; 4 TreeNode* rig...
分类:其他好文   时间:2014-11-27 18:09:13    阅读次数:132
LeetCode:Binary Tree Level Order Traversal
题目:Binay Tree Level Order TraversalGiven a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level...
分类:其他好文   时间:2014-11-27 17:56:43    阅读次数:110
mysql_oracle_随机查询几条记录
数据库的随机查询SQL1. Oracle,随机查询20条select * from(select* from 表名order by dbms_random.value)where rownum <= 20;2.MS SQL Server,随机查询20条select top 20* from表名ord...
分类:数据库   时间:2014-11-27 17:48:27    阅读次数:156
[LeetCode]Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example: Given binary tree {3,9,20,#,#,15,7}, ...
分类:其他好文   时间:2014-11-27 16:14:23    阅读次数:184
Oracle 查询出来的数据取第一条
select * from (select * from order by desc) where rownum=1;select * from (select * from order by ) where rownum=1;
分类:数据库   时间:2014-11-27 15:50:00    阅读次数:166
Search for a Range
Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in the order of O(log n). If the target is not found ...
分类:其他好文   时间:2014-11-27 14:34:49    阅读次数:200
Permutation Sequence
The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence (ie...
分类:其他好文   时间:2014-11-27 14:16:46    阅读次数:156
处理百万级以上的数据提高查询速度的方法(收藏)
处理百万级以上的数据提高查询速度的方法:1.应尽量避免在 where 子句中使用!=或操作符,否则将引擎放弃使用索引而进行全表扫描。2.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。3.应尽量避免在 where 子句中对字段进行 null 值...
分类:其他好文   时间:2014-11-27 12:25:14    阅读次数:232
Tree Traversal
Basic Tree TraversalDepth First Traversal:1. In order traversal----left, root, right----4,2,5,1,32. Pre order traversal-----root, left, right-----1,2,...
分类:其他好文   时间:2014-11-27 07:59:38    阅读次数:232
Leetcode-Sort Colors
Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ...
分类:其他好文   时间:2014-11-27 06:44:23    阅读次数:118
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