关于C++

#include <iostream>
#include <map>
#include <set>
using namespace std;
map < set<int> , int > mp1, mp2;

set<int> s1 = {1, 2, 3}, s2 = {2, 3, 1, 1},
			  s3 = {1, 2, 100}, s4 = {3, 4, 5};

signed  main() {
	cout << (s1 == s2) << '\n';
	mp1[s3] = 9; mp1[s1] = 1;
	mp2[s2] = 1; mp2[s4] = 5;
	
	cout << '\n';
	
	cout << (mp1 < mp2) << ' ';
	cout << mp2[s3] << ' ';
	cout << (mp1 <= mp2) << '\n';	
}