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When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
...or example, if you want to create a replica of a tree, put the nodes in an array with a pre-order traversal. Then perform an Insert operation on a new tree for each value in the array. You will end up with a copy of your original tree.
In-order: : Used to get the values of the nodes in non-decreasi...
Can C++ code be valid in both C++03 and C++11 but do different things?
... as what you say about operator new is accurate (it can now throw std::bad_array_new_length), but your example doesn't show that at all. The code you show is the same in C++03 and C++11 AFAIK.
– Mooing Duck
Apr 14 '14 at 23:43
...
What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...cal documentation:
raise
raise( string )
raise( exception [, string [, array ] ] )
With no arguments, raises the exception in $! or raises a RuntimeError if $! is nil. With a single String argument, it raises a RuntimeError with the string as a message. Otherwise, the first parameter should be...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
...elevant to illustrating the point that (a..b) != (a...(b+1)) despite their array representations being equal (when a,b ∈ ℤ). I’ve updated my answer a bit to expand on that.
– Andrew Marshall
Jul 27 '15 at 23:30
...
Real World Example of the Strategy Pattern
...(an implementation of the strategy interface):
List<String> names = Arrays.asList("Anne", "Joe", "Harry");
Collections.sort(names, new Comparator<String>() {
public int compare(String o1, String o2) {
return o1.length() - o2.length();
}
});
Assert.assertEquals(Arrays.asList("Joe...
Select first row in each GROUP BY group?
...r_id -- lateral reference
ORDER BY total DESC
LIMIT 1
) l;
6. array_agg() with ORDER BY (see other answer)
SELECT (array_agg(id ORDER BY total DESC))[1] AS id
, customer_id
, max(total) AS total
FROM purchases
GROUP BY customer_id;
Results
Execution time for above queries ...
When should I choose Vector in Scala?
...ted with a singly-linked list. Vector is implemented something like Java's ArrayList.
– Josiah Yoder
Aug 12 '15 at 14:43
...
How can we prepend strings with StringBuilder?
...uire copying everything after the insertion point back some in the backing array, so it won't be as quick as appending to the end.
But you can do it like this in Java (in C# it's the same, but the method is called Insert):
aStringBuilder.insert(0, "newText");
...
Getting multiple keys of specified value of a generic Dictionary?
... tried to add to the list it would throw an exception (you can't add to an array). And yes, BiLookup would probably be a better name.
– Jon Skeet
Aug 4 '09 at 15:09
...
Match multiple cases classes in scala
...B"
case _ => "default"
}
}
def main(args: Array[String]) {
val a = A
val b = B("B's s value")
val c = C("C's s value")
println(matcher1(a))
println(matcher1(b))
println(matcher1(c))
val d = D("D's s value")
val e = E("E's s v...