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design a stack such that getMinimum( ) should be O(1)
...sn't enough information. It's simple when you grok it, but it might take a bit of head-scratching at first :)
(The downside of course is that it doubles the space requirement. Execution time doesn't suffer significantly though - i.e. it's still the same complexity.)
EDIT: There's a variation which...
What does 'super' do in Python?
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I had played a bit with super(), and had recognized that we can change calling order.
For example, we have next hierarchy structure:
A
/ \
B C
\ /
D
In this case MRO of D will be (only for Python 3):
In [26]: D.__mro_...
What is 'Pattern Matching' in functional languages?
...it enables the compiler to check the logic of your code, at least a little bit. It really is a killer feature.
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Why use Gradle instead of Ant or Maven? [closed]
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This may be a bit controversial, but Gradle doesn't hide the fact that it's a fully-fledged programming language.
Ant + ant-contrib is essentially a turing complete programming language that no one really wants to program in.
Maven t...
What are attributes in .NET?
...un-time operations such as Reflection.Emit.
For example, you could write a bit of code for profiling that transparently wrapped every single call your code makes and times it. You could "opt-out" of the timing via an attribute that you place on particular methods.
public void SomeProfilingMethod(Me...
Mark parameters as NOT nullable in C#/.NET?
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There's nothing available at compile-time, unfortunately.
I have a bit of a hacky solution which I posted on my blog recently, which uses a new struct and conversions.
In .NET 4.0 with the Code Contracts stuff, life will be a lot nicer. It would still be quite nice to have actual language s...
Create a hexadecimal colour based on a string with JavaScript
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Just porting over the Java from Compute hex color code for an arbitrary string to Javascript:
function hashCode(str) { // java String#hashCode
var hash = 0;
for (var i = 0; i < str.length; i++) {
hash = str.charCodeAt(i) + ((hash << 5) - hash);
}
return ha...
Difference between the Apache HTTP Server and Apache Tomcat? [closed]
...dle most small and medium web site needs. With support for Java NIO and 64-bit memory, even some larger scale web sites may be served well by Tomcat's Catalina module. For various reasons, some folks choose to ignore Catalina and instead use Tomcat's Servlet capabilities behind the Apache httpd web ...
Programmatically saving image to Django ImageField
...that fetches an image off the web and stores it in a model. The important bits are:
from django.core.files import File # you need this somewhere
import urllib
# The following actually resides in a method of my model
result = urllib.urlretrieve(image_url) # image_url is a URL to an image
# sel...
Deleting DataFrame row in Pandas based on column value
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