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mongodb进阶一之高级查询
上篇文章我们讲了mongodb的crud基本操作 http://blog.csdn.net/stronglyh/article/details/46812579 这篇我们来说说mongodb的进阶--------------高级查询 一:各种查询 1:条件操作符 , >= 这个操作符就不用多解释了,最常用也是最简单的。 db.collection.find({ "field" : {...
分类:数据库   时间:2015-07-09 18:11:15    阅读次数:177
[leedcode 32] Longest Valid Parentheses
Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring.For"(()", the longest...
分类:其他好文   时间:2015-07-09 17:29:41    阅读次数:106
find命令
find查找命令常见参数:-name根据文件名寻找文件 -user根据文件拥有者寻找文件 -group根据文件所属组寻找文件 -perm根据文件权限寻找文件 -size根据文件大小寻找文件[±Sizek] -type根据文件类型寻找文件,常见类型有:f(普通文件)、c(字符设备文件)、b(块设备文件)、l(符号链..
分类:其他好文   时间:2015-07-09 14:52:56    阅读次数:131
[LeetCode][Java] 3Sum
题目: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a tripl...
分类:编程语言   时间:2015-07-09 14:42:02    阅读次数:129
leetCode 34.Search for a Range (搜索范围) 解题思路和方法
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...
分类:其他好文   时间:2015-07-09 14:41:20    阅读次数:87
[LeetCode][Java] 3Sum Closest
题目: Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would h...
分类:编程语言   时间:2015-07-09 14:40:16    阅读次数:111
leetcode-230-Kth Smallest Element in a BST
Kth Smallest Element in a BST   Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note:  You may assume k is always valid, 1 ≤ k ≤ BST's to...
分类:其他好文   时间:2015-07-09 14:40:05    阅读次数:122
30 Substring with Concatenation of All Words
30 Substring with Concatenation of All Words链接:https://leetcode.com/tag/hash-table/ 问题描述: You are given a string, s, and a list of words, words, that are all of the same length. Find all starting ind...
分类:其他好文   时间:2015-07-09 14:38:37    阅读次数:94
136 Single Number
136 Single Number链接:https://leetcode.com/problems/single-number/ 问题描述: Given an array of integers, every element appears twice except for one. Find that single one.Note: Your algorithm should hav...
分类:其他好文   时间:2015-07-09 14:34:47    阅读次数:92
[leecode 30] Substring with Concatenation of All Words
You are given a string,s, and a list of words,words, that are all of the same length. Find all starting indices of substring(s) insthat is a concatena...
分类:其他好文   时间:2015-07-09 14:26:16    阅读次数:137
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