Sorting a vector of pairs [closed]

Answer 1

use this,

template
struct sortFunctor: public unary_function, std::pair>
{
    bool operator()(const std::pair& First, const std::pair& Second)
    {
        if(First.first < Second.first)
        {
            return false;
        }
        if(First.first == Second.first && First.second < Second.second)
        {
            return false;
        }
        return true;
    }
}

then pass this functor as a third parameter to sort function.