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Why is reading lines from stdin much slower in C++ than Python?
... Because of different default settings in C++ requiring more system calls.
By default, cin is synchronized with stdio, which causes it to avoid any input buffering. If you add this to the top of your main, you should see much better performance:
std::ios_base::sync_with_stdio(false);
Normally, whe...
Case-insensitive search in Rails model
...put. "#$$" is a little-known shortcut for escaping global variables with Ruby string interpolation. It's equivalent to "#{$$}". But string interpolation doesn't happen to user-input strings. Try these in Irb to see the difference: "$##" and '$##'. The first is interpolated (double-quotes). The secon...
Get java.nio.file.Path object from java.io.File
...
Yes, you can get it from the File object by using File.toPath(). Keep in mind that this is only for Java 7+. Java versions 6 and below do not have it.
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How do function pointers in C work?
... to imply that we're setting the text of some String class to be "hello".
By using function pointers, it is possible to emulate methods in C.
How is this accomplished?
The String class is actually a struct with a bunch of function pointers which act as a way to simulate methods. The following is ...
mmap() vs. reading blocks
... they were in the past, the overall performance can't really be determined by adding up the pros and cons, but only by testing on a particular hardware configuration. For example, it is debatable that "A call to mmap has more overhead than read" - yes mmap has to add mappings to the process page tab...
What are major differences between C# and Java?
...moved.)
Not all of your summary is correct:
In Java methods are virtual by default but you can make them final. (In C# they're sealed by default, but you can make them virtual.)
There are plenty of IDEs for Java, both free (e.g. Eclipse, Netbeans) and commercial (e.g. IntelliJ IDEA)
Beyond that...
What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
..., a new level is created.
Bottom-Left (BL) Algorithm
BL first order items by non-increasing width. BL packs the next item as near to the bottom as it will fit and then as close to the left as it can go without overlapping with any packed item. Note that BL is not a level-oriented packing algorithm....
Biggest GWT Pitfalls? [closed]
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I'll start by saying that I'm a massive GWT fan, but yes there are many pitfalls, but most if not all we were able to overcome:
Problem: Long compile times, as your project grows so does the amount of time it takes to compile it. I've ...
Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...on is not a commutative monoid and so the cumulated value will be computed by a series of sequential aggregations.
foldLeft does not assume commutativity nor associativity. It's associativity that gives the ability to chop up the collection, and it's commutativity that makes cumulating easy beca...
Allowed characters in Linux environment variable names
...n any character except = and NUL, but:
Environment variable names used by the utilities in the Shell and
Utilities volume of IEEE Std
1003.1-2001 consist solely of uppercase letters, digits, and the '_'
(underscore) from the characters
defined in Portable Character Set and
do not begin...