Compilare: main.cpp: In function 'int coef(const std::string&, const std::string&)': main.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int i = 0 ; i<a.size(); i++) | ~^~~~~~~~~ main.cpp:20:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int j = 0; j<b.size(); j++) | ~^~~~~~~~~ main.cpp:18:9: warning: unused variable 'mx' [-Wunused-variable] 18 | int mx = 0; | ^~ main.cpp: In function 'int main()': main.cpp:49:9: warning: unused variable 'sol' [-Wunused-variable] 49 | int sol = 0; | ^~~