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Solving “Who owns the Zebra” programmatically?
...all drink different drinks.
# They all smoke different cigarettes.
for vars_ in (colors, nationalities, pets, drinks, cigarettes):
problem.addConstraint(AllDifferentConstraint(), vars_)
# In the middle house they drink milk.
#NOTE: interpret "middle" in a numerical sense (not geometrical)
probl...
How to decide font color in white or black depending on background color?
...ove.
The formula given for contrast in the W3C Recommendations is (L1 + 0.05) / (L2 + 0.05), where L1 is the luminance of the lightest color and L2 is the luminance of the darkest on a scale of 0.0-1.0. The luminance of black is 0.0 and white is 1.0, so substituting those values lets you determine ...
Problem with converting int to string in Linq to entities
...mespace with EF6, the code will compile just fine but will throw a runtime error. I hope this note helps to avoid some confusion.
– Leo
Dec 22 '16 at 15:27
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if/else in a list comprehension
... because if my l = [ 2, 3, 4, 5] then [x if x % 2 == 0 for x in l] give me error whereas [x if x % 2 == 0 else 200 for x in l] works. Yes I know to filter it I should write [ x for x in l if x % 2 == 0]. Sorry for botheration. Thanks for your answer.
– Grijesh Chauhan
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Rails formatting date
...m/%d/%y)
– RajeshM
Jun 10 '15 at 21:05
1
Use %A if you want the day of the week, e.g. "Wednesday"...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...架开发的分布式NoSQL存储系统，数据采用内存存储，支持连接后端DB实现数据持久化。DCache采用集群模式，具有高扩展、高可用的特点。
https://github.com/Tencent/MMKV MMKV 是基于 mmap 内存映射的 key-value 组件，底层序列化/反序列化...
What generates the “text file busy” message in Unix?
What operation generates the error "text file busy"? I am unable to tell exactly.
12 Answers
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Max length UITextField
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count(textField.text!) gives an error. You must use textField.text!.characters.count
– Regis St-Gelais
Jul 8 '16 at 13:02
1
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How to rsync only a specific list of files?
... has anything starting with .. rsync appears to ignore the .. giving me an error like rsync: link_stat "/home/michael/test/subdir/test.txt" failed: No such file or directory (in this case running from the "test" dir and trying to specify "../subdir/test.txt" which does exist.
–...
.NET / C# - Convert char[] to string
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It is weird because I get compile error if I do not define the type <char>
– sky91
Aug 4 '17 at 1:47
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