#include <iostream>
#include <cstdlib>
#include <map>
using namespace std;

struct mystruct {
	char c;
	int i;
	double d;

	mystruct(char initial_c, int initial_i, double initial_d)
		: c(initial_c), i(initial_i), d(initial_d) {}

	//mystruct(): c(0), i(0), d(0) {}
};

typedef map<int, mystruct> map_t;
typedef map_t::value_type pair_t;

const pair_t a[] = {
	pair_t(10, mystruct('A', 10, 3.14)),
	pair_t(20, mystruct('B', 20, 4.14))
};
const size_t n = sizeof a / sizeof a[0];

int main()
{
	map_t m(a, a + n);
	//cout << m[20].d << "\n";

	map_t::iterator it = m.find(20);
	if (it != m.end()) {
		cout << it->second.d << "\n";
	}
	return EXIT_SUCCESS;
}