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How do you create a static class in C++?
...int buffer, int bitIndex);
// ...lots of great stuff
private:
// Disallow creating an instance of this object
BitParser() {}
};
BitParser.cpp
bool BitParser::getBitAt(int buffer, int bitIndex)
{
bool isBitSet = false;
// .. determine if bit is set
return isBitSet;
}
You can use t...
Finding three elements in an array whose sum is closest to a given number
...t now you don't need the target value anymore.
Clearly, if we simply test all possible 3-tuples, we'd solve the problem in O(n3) -- that's the brute-force baseline. Is it possible to do better? What if we pick the tuples in a somewhat smarter way?
First, we invest some time to sort the array, whic...
Convert a binary NodeJS Buffer to JavaScript ArrayBuffer
... = new Uint32Array(b.buffer, b.byteOffset, b.byteLength / Uint32Array.BYTES_PER_ELEMENT);
No dependencies, moderate speed, any version of Node.js
Use Martin Thomson's answer, which runs in O(n) time. (See also my replies to comments on his answer about non-optimizations. Using a DataView is slo...
Bash foreach loop
... input runs the cat program with the input lines as argument(s).
If you really want to do this in a loop, you can:
for fn in `cat filenames.txt`; do
echo "the next file is $fn"
cat $fn
done
share
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...
Recursion or Iteration?
...n if the recursive function is tail recursive (the last line is recursive call). Tail recursion should be recognized by the compiler and optimized to its iterative counterpart (while maintaining the concise, clear implementation you have in your code).
I would write the algorithm in the way that m...
Automating “enter” keypresses for bash script generating ssh keys
... is shorter, and should ssh-keygen ever add a question, that will automatically be answered in too. :)
– zrajm
Apr 24 '15 at 11:08
...
What specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
I can take a guess based on the names, but what specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
...
What does the “@” symbol do in Powershell?
...
PowerShell will actually treat any comma-separated list as an array:
"server1","server2"
So the @ is optional in those cases. However, for associative arrays, the @ is required:
@{"Key"="Value";"Key2"="Value2"}
Officially, @ is the "array ...
Set up adb on Mac OS X
... it up might be useful to some people. adb is the command line tool to install and run android apps on your phone/emulator
...
How is “int* ptr = int()” value initialization not illegal?
...: In ubuntu 11.04 and our own linux flavor, libio.h contains: #if !defined(__cplusplus) \n #define NULL ((void*)0) \n #else \n #define NULL (0) the current version of gcc in ubuntu is 4.5, in our system is 4.0.
– David Rodríguez - dribeas
Nov 9 '11 at 17:33
...