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Best practices for circular shift (rotate) operations in C++
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105
See also an earlier version of this answer on another rotate question with some more details ab...
Regexp Java for password validation
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Try this:
^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\S+$).{8,}$
Explanation:
^ # start-of-string
(?=.*[0-9]) # a digit must occur at least once
(?=.*[a-z]) # a lower case letter must occur at leas...
Changing UIButton text
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Alex Zavatone
3,1763030 silver badges4545 bronze badges
answered Jul 10 '12 at 15:50
Jesse GumpoJesse Gumpo
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How do I determine k when using k-means clustering?
...imation of the number of clusters" by Dan Pelleg and Andrew Moore in ICML 2000.
Another approach is to start with a large value for k and keep removing centroids (reducing k) until it no longer reduces the description length. See "MDL principle for robust vector quantisation" by Horst Bischof, Ale...
The cast to value type 'Int32' failed because the materialized value is null
...where there can be unexpected nulls in different places. ...DefaultIfEmpty(0).Sum(0) can help in this (quite simple) case, where there might be no elements and sql's SUM returns null whereas c# expect 0.
A more general approach is to use ?? which will be translated to COALESCE whenever there is a r...
Git copy file preserving history [duplicate]
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edited Dec 7 '16 at 20:56
jschreiner
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answered...
Syntax of for-loop in SQL Server
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answered May 20 '11 at 7:57
jamsjams
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Ideal way to cancel an executing AsyncTask
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answered Apr 29 '10 at 19:28
yanchenkoyanchenko
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Why historically do people use 255 not 256 for database field magnitudes?
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170
With a maximum length of 255 characters, the DBMS can choose to use a single byte to indicate th...
How can I add the new “Floating Action Button” between two widgets/layouts
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