Hi.
I'm using :) such a construction in my code

struct maxY {
    bool operator () (const int& n1, const int& n2) {
              // compare something
    }
};

...

set<int, maxY> s;

in my VS 2009 it's ok, but Online Judge says it's a compilation error. Help to fix, please.

Oh, yeah, thanks :)
Any other thoughts?

I've got, what's the problem.

bool operator()(int t1, int t2)const {
...
}

should be written