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Find kth smallest element in a binary search tree in Optimum way
...he number of elements in the left subtree, to decide whether to do recurse into the left or right subtree.
Now, suppose we are at node T:
If k == num_elements(left subtree of T), then the answer we're looking for is the value in node T.
If k > num_elements(left subtree of T), then obviously we...
What does the “map” method do in Ruby?
...example:
names = ['danil', 'edmund']
# here we map one array to another, convert each element by some rule
names.map! {|name| name.capitalize } # now names contains ['Danil', 'Edmund']
names.each { |name| puts name + ' is a programmer' } # here we just do something with each element
The output:...
How to add leading zeros?
...
Note that sprintf converts numeric to string (character).
– aL3xa
Apr 28 '11 at 8:54
...
Items in JSON object are out of order using “json.dumps”?
I'm using json.dumps to convert into json like
6 Answers
6
...
What is the difference between atomic / volatile / synchronized?
How do atomic / volatile / synchronized work internally?
7 Answers
7
...
Is it better to call ToList() or ToArray() in LINQ queries?
I often run into the case where I want to eval a query right where I declare it. This is usually because I need to iterate over it multiple times and it is expensive to compute. For example:
...
Is there a performance difference between a for loop and a for-each loop?
...
From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferre...
Counting inversions in an array
...cult time seeing how I can use this to find the number of inversions. Any hints or help would be greatly appreciated.
36 An...
A definitive guide to API-breaking changes in .NET
...)
API before change
public static class Foo
{
public static void bar(int i);
}
API after change
public static class Foo
{
public static bool bar(int i);
}
Sample client code working before change
Foo.bar(13);
...
How to add a button dynamically in Android?
...
try this:
for (int i = 1; i <= 20; i++) {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
Button btn = new...