Compilare: main.cpp: In function 'std::string prod(int, int)': main.cpp:15:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(i=0; i<rasp[0].size(); i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'std::string add()': main.cpp:43:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(i=0; i<rasp[2].size(); i++) | ~^~~~~~~~~~~~~~~ main.cpp:42:9: warning: unused variable 'remax' [-Wunused-variable] 42 | int remax=rasp[2].size(); | ^~~~~ main.cpp: In function 'int main()': main.cpp:67:9: warning: unused variable 'n' [-Wunused-variable] 67 | int n,k,i,j; | ^