CPP
cpp
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#include <iostream>
using namespace std;
#include <map>
class test
{
public:
test(int a = 0) : m_a(a){}
bool operator<(const test& obj) const
{
return m_a<obj.m_a;
}
int m_a;
};
int main() {
map<test,test> mp1 = {{test(1),test(2)}};
map<test,test> mp2 = {{test(1),test(2)}};
map<map<test,test>,int> mp;
mp[mp1] = 1;
mp[mp2] = 2;
cout << mp.size() << endl;
return 0;
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OUTPUT
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