如何像向量一样通过索引访问集合元素？

Question

I have made a code that construct a set of sets. However, I want to access set index like vector *(vec.begin()+i).Is it possible like accessing vector? I got an error,Please help me, Is there any solution

#include <iostream>
#include <set>
using namespace std;

int main ()
{
  int myints[] = {75,23,65,42,13};
  std::set<int> myset (myints,myints+5);

  std::cout << "myset contains:";
  for (int i = 0; i < myset.size(); i++) {
      cout<<*(myset.begin()+i);
  }


  std::cout << '\n';

  return 0;
}

Answer 1

You can with std::next . But it's not a good idea for std::set because it must linearly increment the iterator.

auto third = std::next(myset.begin(), 2);