map 如何比大小呢？

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;
mp1[s3]=9,mp1[s1]=1;
mp2[s2]=1,mp2[s4]=5;
cout<<(mp1<mp2)<<' '<<mp2[s3]<<' '<<(mp1<=mp2);

上述代码该输出什么