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Designing function f(f(n)) == -n
A question I got on my last interview:
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How to form tuple column from two columns in Pandas
I've got a Pandas DataFrame and I want to combine the 'lat' and 'long' columns to form a tuple.
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std::vector performance regression when enabling C++11
I have found an interesting performance regression in a small C++ snippet, when I enable C++11:
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Two color borders
Client wants two color borders for an embossed look. Can I do this on one element? I was hoping to avoid stacking two DOM elements with individual borders.
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How can I convert a Unix timestamp to DateTime and vice versa?
There is this example code, but then it starts talking about millisecond / nanosecond problems.
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How can I quickly sum all numbers in a file?
I have a file which contains several thousand numbers, each on it's own line:
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How do I get an object's unqualified (short) class name?
How do I check the class of an object within the PHP name spaced environment without specifying the full namespaced class.
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How to iterate for loop in reverse order in swift?
When I use the for loop in Playground, everything worked fine, until I changed the first parameter of for loop to be the highest value. (iterated in descending order)
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The $.param( ) inverse function in JavaScript / jQuery
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In php, is 0 treated as empty?
Code will explain more:
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