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Programmatically find the number of cores on a machine
...ine how many cores a machine has from C/C++ in a platform-independent way? If no such thing exists, what about determining it per-platform (Windows/*nix/Mac)?
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In which order should floats be added to get the most precise result?
...e are 1 billion values equal to 1 / (1 billion), and one value equal to 1. If the 1 comes first, then the sum will come to 1, since 1 + (1 / 1 billion) is 1 due to loss of precision. Each addition has no effect at all on the total.
If the small values come first, they will at least sum to something...
Is there an MD5 Fixed Point where md5(x) == x?
...so have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a fixed point is 1/2128.
Thus, the probability that no 128-bit string is a fixed point is (1 − 1/2128)2128, so the probabili...
Get all directories within directory nodejs
...
Note this breaks if there are symlinks in the directory. Use lstatSync instead.
– Dave
May 9 '17 at 0:37
...
SecurityError: Blocked a frame with origin from accessing a cross-origin frame
I am loading an <iframe> in my HTML page and trying to access the elements within it using Javascript, but when I try to execute my code, I get the following error:
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How can I run a function from a script in command line?
...
If the script only defines the functions and does nothing else, you can first execute the script within the context of the current shell using the source or . command and then simply call the function. See help source for mo...
Simplest way to wait some asynchronous tasks complete, in Javascript?
...callback) {
conn.collection(name).drop(function(err) {
if (err)
return callback(err);
console.log('dropped');
callback(null, name);
});
}
)});
async.parallel(calls, function(err, result) {
/* this code will run after all ca...
Opening a folder in explorer and selecting a file
.../ suppose that we have a test.txt at E:\
string filePath = @"E:\test.txt";
if (!File.Exists(filePath))
{
return;
}
// combine the arguments together
// it doesn't matter if there is a space after ','
string argument = "/select, \"" + filePath +"\"";
System.Diagnostics.Process.Start("explorer.e...
Where to place and how to read configuration resource files in servlet based application?
...properties file and access it when required. Is this a correct procedure, if so then where should I place this file? I am using Netbeans IDE which is having two separate folders for source and JSP files.
...
Write a program to find 100 largest numbers out of an array of 1 billion numbers
...et billionlog2(100) which is better than billionlog2(billion)
In general, if you need the largest K numbers from a set of N numbers, the complexity is O(NlogK) rather than O(NlogN), this can be very significant when K is very small comparing to N.
EDIT2:
The expected time of this algorithm is pre...