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Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...que ID (please let me know if there are more):
Before this discussion, recall that the BSON Object ID consists of:
[4 bytes seconds since epoch, 3 bytes machine hash, 2 bytes process ID, 3 bytes counter]
Here are the three possibilities, so you judge for yourself how likely it is to get a dupe:
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数据挖掘——分词入门 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...词典的分词，这种方式简单暴力可以解决百分之七八十的问题。基于词典的分词大概分为以下几种方式：
1、正向最大匹配，沿着我们看到的句子逐字拆分后组合成词语到词典里去匹配，直到匹配不到词语为止。举个实际的例子...
Function to calculate distance between two coordinates
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这个问题问了JavaScript的答案。. You have to convert it to english :)
– VulfCompressor
Oct 12 '15 at 15:56
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Zero-pad digits in string
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First of all, your description is misleading. Double is a floating point data type. You presumably want to pad your digits with leading zeros in a string. The following code does that:
$s = sprintf('%02d', $digit);
For more informa...
Get Image Height and Width as integer values?
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@poke: are you really 100% sure?
– Sarfraz
Feb 18 '10 at 5:04
5
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How to decode Unicode escape sequences like “\u00ed” to proper UTF-8 encoded characters?
...PHP that can decode Unicode escape sequences like " \u00ed " to " í " and all other similar occurrences?
7 Answers
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思维导图在快速阅读或是其它学习工作中的作用 - 创意 - 清泛网 - 专注C/C++...
...其它学习工作中的作用思维导图一、人的大脑运用带来的问题您是否经常遇到过这样的情况：1、您买了很多书，可惜很多都没有读？就是有幸读过也掌握不了多少？2、走...
思维导图
一、人的大脑运用带来的问题
您是否经常...
Getting the location from an IP address [duplicate]
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You could download a free GeoIP database and lookup the IP address locally, or you could use a third party service and perform a remote lookup. This is the simpler option, as it requires no setup, but it does introduce additional latency.
One third party service you could use is mine, http://...
解决笔记本升级Win10后，色彩变暗颜色偏蓝的问题 - 更多技术 - 清泛网 - 专...
解决笔记本升级Win10后，色彩变暗颜色偏蓝的问题笔记本升级Win10后，色彩变暗颜色偏蓝，调整Win10显示设置中的颜色校准也没有效果，最后通过勾选显卡属性中的色温控制恢复以前Win8.1时的颜...笔记本升级Win10后，色彩变暗颜色...
问答和论坛的区别 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...形态。用户进入一个问答网站之后，能够非常直观的看到问题和其中部分点赞数最高的答案，而用户进入论坛网站之后，一般情况下看到的...一、产品形态。
用户进入一个问答网站之后，能够非常直观的看到问题和其中部分点...