Compilare: main.cpp: In function 'std::set<int> Plus(std::set<int>, std::set<int>)': main.cpp:14:7: warning: unused variable 'i' [-Wunused-variable] 14 | int i = 0, j = 0; | ^ main.cpp:14:14: warning: unused variable 'j' [-Wunused-variable] 14 | int i = 0, j = 0; | ^ main.cpp: In function 'std::set<int> Ori(std::set<int>, std::set<int>)': main.cpp:24:7: warning: unused variable 'i' [-Wunused-variable] 24 | int i = 0, j = 0; | ^ main.cpp:24:14: warning: unused variable 'j' [-Wunused-variable] 24 | int i = 0, j = 0; | ^ main.cpp: In function 'int main()': main.cpp:91:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 91 | while (P < aux.size()) { | ~~^~~~~~~~~~~~