C++ writing style

When writing code (in C++ particularly), where do you put your curly braces?

ex:
int main()
{

}

OR...

int main(){

}

which do you think is better? clearer? more professional?

From a professional point of view they're both good. Personally, I prefer the first one. Looks more balanced, I like that.
At my uni they told us to use the second one though.
Either way, it doesn't really matter.