#include <algorithm>
#include <iterator>
#include <iostream>
#include <ostream>
#include <vector>
 
using namespace std;
 
template<typename RandomAccessIterator>
RandomAccessIterator median(RandomAccessIterator first,RandomAccessIterator last)
{
   RandomAccessIterator m = first + distance(first,last)/2; // handle even middle if needed
   nth_element(first,m,last);
   return m;
}
 
int main()
{
   vector<int> values = {5,1,2,4,3};
   cout << *median(begin(values),end(values)) << endl;
}
 

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