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Time complexity of Sieve of Eratosthenes algorithm
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Your n/2 + n/3 + n/5 + … n/97 is not O(n), because the number of terms is not constant. [Edit after your edit: O(n2) is too loose an upper bound.] A loose upper-bound is n(1+1/2+1/3+1/4+1/5+1/6+…1/n) (sum of reciprocals of all numbers...
Comparing two CGRects
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Johannes Fahrenkrug
36.9k1616 gold badges110110 silver badges148148 bronze badges
answered Sep 16 '13 at 3:44
Amelia777Am...
Visual Studio Editor does not underline errors anymore
...lly tell when, but it can be related to the installation of .Net Framework 3.5 SP 1 or the MVC Beta (which I guess is unlikely). Furthermore have I installed and uninstalled both CodeRush and Resharper for evaluation purposes (decided not to keep either one of them).
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TypeError: sequence item 0: expected string, int found
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38
Can also use .join(map(str, value_list))
– BallpointBen
May 17 '18 at 13:37
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How to compare two dates?
...= datetime.now()
>>> past < present
True
>>> datetime(3000, 1, 1) < present
False
>>> present - datetime(2000, 4, 4)
datetime.timedelta(4242, 75703, 762105)
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How do I use CMake?
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32
CMake takes a CMakeList file, and outputs it to a platform-specific build format, e.g. a Makefi...
How is pattern matching in Scala implemented at the bytecode level?
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3 Answers
3
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Find difference between timestamps in seconds in PostgreSQL
I have a table in PostgreSQL 8.3 with 2 timestamp columns. I would like to get the difference between these timestamps in seconds. Could you please help me how to get this done?
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