lst-0097-godb.cpp
//#(compile) c++; compiler:g141; options:-O1 -std=c++23; libs:-
// https://godbolt.org/z/aMj87neG6
#include <set> // multiset
#include <iostream>
using std::multiset; using std::cout;
template<typename Elem, typename Comp>
std::ostream& operator<<=(std::ostream&os, const multiset<Elem,Comp>&data) {
for(auto &e : data) {
os << e << ' ';
}
return os << '\n'; // '<<=' instead of '<<' for line break
}
int main() {
// Example code here
}