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How do I generate a random int number?
How do I generate a random integer in C#?
32 Answers
32
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See what process is using a file in Mac OS X
I would like to be able to track a file and see which process is touching that file. Is that possible? I know that I can see the list of open processes in activity monitor but I think it's happening to quickly for me to see it. The reason for this is I'm using a framework and I think the system v...
Why is quicksort better than mergesort?
I was asked this question during an interview. They're both O(nlogn) and yet most people use Quicksort instead of Mergesort. Why is that?
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How to ssh to vagrant without actually running “vagrant ssh”?
... the way Vagrant logs in to my VM within a shell script using an ssh command, so I create an alias to my Vagrant instance.
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How do I detect whether a Python variable is a function?
I have a variable, x , and I want to know whether it is pointing to a function or not.
25 Answers
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Timeout command on Mac OS X?
Is there an alternative for the timeout command on Mac OSx. The basic requirement is I am able to run a command for a specified amount of time.
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How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...ow about accesing data from one structure vs the other? I'm thinking cache and location
– Horia Toma
Apr 14 '14 at 22:38
9
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Obtaining a powerset of a set in Java
...2^n possible combinations. Here's a working implementation, using generics and sets:
public static <T> Set<Set<T>> powerSet(Set<T> originalSet) {
Set<Set<T>> sets = new HashSet<Set<T>>();
if (originalSet.isEmpty()) {
sets.add(new HashS...
How to create a HashMap with two keys (Key-Pair, Value)?
...= 31 * result + y;
return result;
}
}
Implementing equals() and hashCode() is crucial here. Then you simply use:
Map<Key, V> map = //...
and:
map.get(new Key(2, 5));
Table from Guava
Table<Integer, Integer, V> table = HashBasedTable.create();
//...
table.get(2, 5);...
Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
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