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Find the most common element in a list

What is an efficient way to find the most common element in a Python list? 21 Answers ...
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What's wrong with nullable columns in composite primary keys?

ORACLE does not permit NULL values in any of the columns that comprise a primary key. It appears that the same is true of most other "enterprise-level" systems. ...
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Abstract Class vs Interface in C++ [duplicate]

This is a general question about C++. As you know, there is no clear distinction between interface and abstract class in C++ unlike Java and C#. When would it be more preferrable to use an interface instead of an abstract class in C++? Could you give some examples? ...
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How to change my Git username in terminal?

I was pushing and pulling from git in Terminal then I changed my username on github.com. I went to push some changes and it couldn't push because it was still recognizing my old username.. How do I change/update my username on git in terminal? ...
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What should be in my .gitignore for an Android Studio project?

What files should be in my .gitignore for an Android Studio project? 31 Answers 31 ...
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Python: finding an element in a list [duplicate]

What is a good way to find the index of an element in a list in Python? Note that the list may not be sorted. 10 Answers ...
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Should commit messages be written in present or past tense? [closed]

So which is it that you think is better and more intuitive? 12 Answers 12 ...
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Use dynamic variable names in JavaScript

In PHP you can do amazing/horrendous things like this: 17 Answers 17 ...
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Service Reference Error: Failed to generate code for the service reference

I have a Windows Service Solution and am trying to add a service reference to a Hermes(Opensource ebms message server) Web Service in VS2010. ...
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What is the difference between ApplicationContext and WebApplicationContext in Spring MVC?

...ard javax.servlet.ServletContext so it's able to communicate with the container. public interface WebApplicationContext extends ApplicationContext { ServletContext getServletContext(); } Beans, instantiated in WebApplicationContext will also be able to use ServletContext if they implement S...