infoarena

 class mycomparison
{
  bool reverse;
public:
  mycomparison(const bool& revparam=false)
    {reverse=revparam;}
  bool operator() (const int& lhs, const int&rhs) const
  {
    if (reverse) return (lhs>rhs);
    else return (lhs<rhs);
  }
};
 typedef std::priority_queue<int,std::vector<int>,mycomparison> mypq_type;

struct elev {
 ...
};

struct comp {
 bool operator() (const elev &a, const elev &b) const {
    // functia returneaza true in cazul in care a < b, altfel false
 }
};

priority_queue<elev,vector<elev>,comp> pq;