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Fast way of counting non-zero bits in positive integer

... Or just define it literally: counts = (b'\x00\x01\x01\x02\x01\x02\x02\x03\x01\x02\x02\x03\x02\x03\x03\x04' b'\x01\x02\x02\x03\x02\x03\x03\x04\x02\x03\x03\x04\x03\x04\x04\x05' b'\x01\x02\x02\x03\x02\x03\x03\x04\x02\x03\x03\x04\x03\x04\x04\x05' b'\x02\x03\x03\x04\x03\...
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Get first day of week in PHP?

... a bit across PHP versions: Output for 5.3.0 - 5.6.6, php7@20140507 - 20150301, hhvm-3.3.1 - 3.5.1 2015-03-16 2015-03-22 Output for 4.3.5 - 5.2.17 2015-03-23 2015-03-22 Output for 4.3.0 - 4.3.4 2015-03-30 2015-03-29 Comparing at Edge-Cases Relative descriptions like this week have their o...
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Can C++ code be valid in both C++03 and C++11 but do different things?

Is it possible for C++ code to conform to both the C++03 standard and the C++11 standard, but do different things depending on under which standard it is being compiled? ...
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Best way to work with dates in Android SQLite [closed]

...earsonArtPhotoPearsonArtPhoto 34.7k1616 gold badges103103 silver badges135135 bronze badges 17 ...
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How to compare dates in datetime fields in Postgresql?

... timezone'. Client can search over this field with only date (i.e: 2013-05-03) or date with time (i.e: 2013-05-03 12:20:00). This column has the value as timestamp for all rows currently and have the same date part(2013-05-03) but difference in time part. ...
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Unique combination of all elements from two (or more) vectors

...1 4 ABC 2012-05-02 5 DEF 2012-05-02 6 GHI 2012-05-02 7 ABC 2012-05-03 8 DEF 2012-05-03 9 GHI 2012-05-03 10 ABC 2012-05-04 11 DEF 2012-05-04 12 GHI 2012-05-04 13 ABC 2012-05-05 14 DEF 2012-05-05 15 GHI 2012-05-05 If the resulting order isn't what you want, you can sort afterwards....
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What breaking changes are introduced in C++11?

...IS has a section for incompatibilities, at appendix C.2 "C++ and ISO C++ 2003". Summary, paraphrasing the FDIS here, to make it (better) suitable as a SO answer. I added some examples of my own to illustrate the differences. There are a few library-related incompatibilities where I don't exactly ...
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Combine Date and Time columns using python pandas

...02-06-2013 21:00:00 3 02-06-2013 22:00:00 4 02-06-2013 23:00:00 5 03-06-2013 01:00:00 6 03-06-2013 21:00:00 7 03-06-2013 22:00:00 8 03-06-2013 23:00:00 9 04-06-2013 01:00:00 dtype: object In [12]: pd.to_datetime(df['Date'] + ' ' + df['Time']) Out[12]: 0 2013-01-06 23:00:00 1 ...
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C# DateTime to “YYYYMMDDHHMMSS” format

... This site has great examples check it out // create date time 2008-03-09 16:05:07.123 DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123); String.Format("{0:y yy yyy yyyy}", dt); // "8 08 008 2008" year String.Format("{0:M MM MMM MMMM}", dt); // "3 03 Mar March" month Strin...
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How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?

...d down example: # ll /sys/class/tty/ttyUSB* lrwxrwxrwx 1 root root 0 2012-03-28 20:43 /sys/class/tty/ttyUSB0 -> ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/ttyUSB0/tty/ttyUSB0/ lrwxrwxrwx 1 root root 0 2012-03-28 20:44 /sys/class/tty/ttyUSB1 -> ../../devices/pci0000:00/0000...