#include<bits/stdc++.h>
using namespace std;
set <int> s1 = {1, 2, 3}, s2 = {2, 3, 1, 1}, s3 = {1, 2, 100}, s4 = {3, 4, 5};
map <set <int>, int> mp1, mp2;
int main() {
	cout << (s1 == s2) << endl;
	mp1[s3] = 9; mp1[s1] = 1;
	mp2[s2] = 1; mp2[s4] = 5;
	cout << (mp1 < mp2) << ' '; 
	cout << mp2[s3] << ' ';
	cout << (mp1 <= mp2);
	return 0;
}

就是今年的SCP-S，不是很理解为什么 mp1 < mp2的结果是 1 ，但mp1 $<=$ mp2的结果是 0，