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Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell

I have taken Problem #12 from Project Euler as a programming exercise and to compare my (surely not optimal) implementations in C, Python, Erlang and Haskell. In order to get some higher execution times, I search for the first triangle number with more than 1000 divisors instead of 500 as stated...
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How to sort with a lambda?

I'd like to use a lambda function to sort custom classes in place of binding an instance method. However, the code above yields the error: ...
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Unique (non-repeating) random numbers in O(1)?

I'd like to generate unique random numbers between 0 and 1000 that never repeat (i.e. 6 doesn't show up twice), but that doesn't resort to something like an O(N) search of previous values to do it. Is this possible? ...
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How can I print literal curly-brace characters in python string and also use .format on it?

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Numpy how to iterate over columns of array?

Suppose I have and m x n array. I want to pass each column of this array to a function to perform some operation on the entire column. How do I iterate over the columns of the array? ...
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Change Bootstrap tooltip color

What I'm trying to do is change the tooltip color to red. However, I also want to have multiple other colors so I don't simply want to replace the original tooltip's color. ...
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How to match all occurrences of a regex

Is there a quick way to find every match of a regular expression in Ruby? I've looked through the Regex object in the Ruby STL and searched on Google to no avail. ...
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How to install latest (untagged) state of a repo using bower?

I have a very small repo in which I do all dev work in the master branch and use tags as "stable" points in history. 6 An...
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How do I print the elements of a C++ vector in GDB?

I want to examine the contents of a std::vector in GDB, how do I do it? Let's say it's a std::vector<int> for the sake of simplicity. ...
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How do I detect a click outside an element?

I have some HTML menus, which I show completely when a user clicks on the head of these menus. I would like to hide these elements when the user clicks outside the menus' area. ...