void push(const value_type& x);
Effects:
c.push_back(x); push_heap(c.begin(), c.end(), comp);
Effects:
c.push_back(std::move(x)); push_heap(c.begin(), c.end(), comp);
template <class... Args> void emplace(Args&&... args)
Effects:
c.emplace_back(std::forward<Args>(args)...); push_heap(c.begin(), c.end(), comp);
Effects:
pop_heap(c.begin(), c.end(), comp); c.pop_back();