Given an array where elements are sorted in ascending order, convert it to a height balanced BST.Solution:/** * Definition for binary tree * public cl...
分类:
其他好文 时间:
2014-10-27 06:51:31
阅读次数:
137
SELECT语句的执行的逻辑查询处理步骤:(11) (1)FROM (3) JOIN (2) ON (4)WHERE (5)GROUP BY (6)WITH {CUBE | ROLLUP}(7)HAVING (8)SELECT (9)DISTINCT(10)ORDER BY 每个步骤产生一个虚拟.....
分类:
其他好文 时间:
2014-10-26 21:04:48
阅读次数:
203
什么是Activity 关键字:应用组件、四大组件、用户界面,交互。An Activity is an application component that provides a screen with which users can interact in order to do somethin...
分类:
移动开发 时间:
2014-10-26 18:16:39
阅读次数:
346
Given a string containing just the characters
'(', ')', '{', '}', '[' and
']', determine if the input string is valid.
The brackets must close in the correct order,
"()" and "()[]{}" are all val...
分类:
其他好文 时间:
2014-10-26 17:02:49
阅读次数:
142
【题目】
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it...
分类:
其他好文 时间:
2014-10-26 14:21:29
阅读次数:
243
1.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。2.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索引而进行全表扫描,如:select id from t where num is null可以在num...
分类:
数据库 时间:
2014-10-26 13:07:32
阅读次数:
312
Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't mat...
分类:
其他好文 时间:
2014-10-26 13:01:15
阅读次数:
208
//
// main.m
// SortGroup
//
// Created by beyond on 14-10-26.
// Copyright (c) 2014年 beyond.com All rights reserved.
// 按GroupTag分组和 按Order字段排序 enabled表示不启用
#import
int main(int argc, const c...
分类:
移动开发 时间:
2014-10-26 11:46:44
阅读次数:
262
Given a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from left to right, level by level).For example:Given binary tree{3,9,2...
分类:
其他好文 时间:
2014-10-26 06:48:34
阅读次数:
188
Given a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, level by level from leaf to root).For exa...
分类:
其他好文 时间:
2014-10-26 06:47:17
阅读次数:
187