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how to calculate binary search complexity
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Check if two linked lists merge. If so, where?
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edited Oct 20 '09 at 14:41
answered Oct 20 '09 at 12:47
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How to retrieve all keys (or values) from a std::map and put them into a vector?
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edited Aug 21 at 16:47
Srijan Chaudhary
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answere...
Random record in ActiveRecord
...e current record count) as an offset.
offset = rand(Model.count)
# Rails 4
rand_record = Model.offset(offset).first
# Rails 3
rand_record = Model.first(:offset => offset)
To be honest, I've just been using ORDER BY RAND() or RANDOM() (depending on the database). It's not a performance issue ...
Delete a key from a MongoDB document using Mongoose
...e({_id: user._id}, {$unset: {field: 1 }}, callback);
And since version 2.4, if you have an instance of a model already you can do:
doc.field = undefined;
doc.save(callback);
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Why is printing to stdout so slow? Can it be sped up?
...ines.
However, with the above modifications to write unbuffered, it takes 40 seconds to write only 1,000 lines to disk. I gave up waiting for 100,000 lines to write, but extrapolating from the previous, it would take over an hour.
That puts the terminal's 11 seconds into perspective, doesn't it?
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How to apply specific CSS rules to Chrome only?
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Henry Henrinson
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answered Nov 27 '12 at 15:23
Martin Kristians...
How to change indentation mode in Atom?
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Jon Koops
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answered Mar 24 '14 at 14:14
blomblom
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Determine which element the mouse pointer is on top of in JavaScript
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edited Jan 11 '12 at 1:48
answered Jan 11 '12 at 1:42
qw...
Why does changing the sum order returns a different result?
...of binary floating point, we were using a decimal floating point type with 4 significant digits, where each addition is performed at "infinite" precision and then rounded to the nearest representable number. Here are two sums:
1/3 + 2/3 + 2/3 = (0.3333 + 0.6667) + 0.6667
= 1.000 + 0...