sets and do operations on them

I try to take the difference of two sets and record the rest into another set...
but it is giving me errors

Code:

---

set<int> a,b,c;
c = set_difference(a.begin(),a.end(),b.begin(),b.end(),c.begin());

---

what should I do?

That last parameter needs to be std::inserter(c, c.begin()) not c.begin()

http://www.sgi.com/tech/stl/set.html