How can I get the maximum or minimum value in a vector?

How can I get the maximum or minimum value in a vector in C++?

And am I wrong in assuming it would be more or less the same with an array?

I need an iterator, right? I tried it with max_element, but I kept getting an error.

vector<int>::const_iterator it;
it = max_element(cloud.begin(), cloud.end());

error: request for member ‘begin’ in ‘cloud’, which is of non-class type ‘int [10]’