// using std::pair to make pairs of almost anything
#include<iostream>
#include<vector>
int main()
{
  std::pair<int,int> iipair;
  iipair= std::make_pair(10,12);
  std::cout<<iipair.first<<" "<<iipair.second<<std::endl;

  std::pair<int,double> idpair(1,120.324); 
  std::cout<<idpair.first<<" "<<idpair.second<<std::endl;

  // vector of pairs (int,vector)
  std::vector< std::pair<int,std::vector<double>> > ivpairs; 
  std::vector<double> v{10.1,20.2,30.3,40.4}; // testing vector
  for(int i=0; i<10;++i)  ivpairs.push_back(std::make_pair(i,v));
  for(auto i:ivpairs) {
    std::cout<<"i="<<i.first<<" vector="; 
    for(auto j:i.second) std::cout<<j<<" ";
    std::cout<<std::endl;
  }
}