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Hashset vs Treeset
...of elements
It is generally faster to add elements to the HashSet and then convert the collection to a TreeSet for a duplicate-free sorted traversal.
None of these implementations are synchronized. That is if multiple threads access a set concurrently, and at least one of the threads modifies the se...
How should one use std::optional?
... paper: N3672, std::optional:
optional<int> str2int(string); // converts int to string if possible
int get_int_from_user()
{
string s;
for (;;) {
cin >> s;
optional<int> o = str2int(s); // 'o' may or may not contain an int
if (o) { ...
How to get the name of enumeration value in Swift?
...you can now print type names and enum cases by default using print(_:), or convert to String using String's init(_:) initializer or string interpolation syntax. So for your example:
enum City: Int {
case Melbourne = 1, Chelyabinsk, Bursa
}
let city = City.Melbourne
print(city)
// prints "Melbo...
Can someone give an example of cosine similarity, in a very simple, graphical way?
... are 8-dimensional. A virtue of using cosine similarity is clearly
that it converts a question that is beyond human ability to visualise to one
that can be. In this case you can think of this as the angle of about 35
degrees which is some 'distance' from zero or perfect agreement.
...
Calculating distance between two points, using latitude longitude?
...n2(Math.sqrt(a), Math.sqrt(1 - a));
double distance = R * c * 1000; // convert to meters
double height = el1 - el2;
distance = Math.pow(distance, 2) + Math.pow(height, 2);
return Math.sqrt(distance);
}
sh...
Why use non-member begin and end functions in C++11?
...sn't a use for it. Pointers are pointers, arrays are arrays. Arrays can be converted to a pointer to their first element implicitly, but the is still just a regular old pointer, with no distinction with others. Of course you can't get the "end" of a pointer, case closed.
– GMan...
Go > operators
... nice answer, I binary shifting seemed troublesome at first but converting the value to decimal with powers to 2 helps well to get it
– minhajul
Aug 20 '18 at 6:46
...
How to concatenate items in a list to a single string?
...
A more generic way to convert python lists to strings would be:
>>> my_lst = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> my_lst_str = ''.join(map(str, my_lst))
>>> print(my_lst_str)
'12345678910'
...
How to efficiently concatenate strings in go
...
If you have a string slice that you want to efficiently convert to a string then you can use this approach. Otherwise, take a look at the other answers.
There is a library function in the strings package called Join:
http://golang.org/pkg/strings/#Join
A look at the code of Join s...
High Quality Image Scaling Library [closed]
...1 this works brilliantly! One issue you need to correct in this code is to convert the quality variable to a long prior to passing it to the encoder param or you will get a invalid parameter runtime exception.
– James
Aug 4 '10 at 18:00
...