C++ std::set 取第一个元素

#include 
#include 

using namespace std;

int main()
{
	
    // cbegin/cend(c++11): Returns a const_iterator pointing to the first element in the container/
	// Returns a const_iterator pointing to the past-the-end element in the container
	std::set myset = { 50, 20, 60, 10, 25 };
 
	std::cout