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How to sum up elements of a C++ vector?

What are the good ways of finding the sum of all the elements in a std::vector ? 11 Answers ...
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EditText, clear focus on touch outside

My layout contains ListView , SurfaceView and EditText . When I click on the EditText , it receives focus and the on-screen keyboard pops up. When I click somewhere outside of the EditText , it still has the focus (it shouldn't). I guess I could set up OnTouchListener 's on the other views in...
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Building and running app via Gradle and Android Studio is slower than via Eclipse

I have a multi-project (~10 modules) of which building takes about 20-30 seconds each time. When I press Run in Android Studio, I have to wait every time to rebuild the app, which is extremely slow. ...
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Remove blank lines with grep

I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system. 14 Answers ...
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Sort hash by key, return hash in Ruby

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How to fix 'android.os.NetworkOnMainThreadException'?

I got an error while running my Android project for RssReader. 59 Answers 59 ...
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Compare two objects and find the differences [duplicate]

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Issue pushing new code in Github

I created a new repository on Github which has only Readme.md file now. 14 Answers 14 ...
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Rails raw SQL example

How can I convert this code to raw sql and use in rails? Because When I deploy this code in heroku,there is a request timeout error.I think this will be faster if I use raw sql. ...