0_0_39221745_20139.cpp: In function 'int countCommonCDs(const std::set<int>&, const std::set<int>&)':
0_0_39221745_20139.cpp:9:5: error: 'set_intersection' was not declared in this scope; did you mean 'intersection'?
9 | set_intersection(jackCDs.begin(), jackCDs.end(),
| ^~~~~~~~~~~~~~~~
| intersection
|