Compilare: main.cpp: In function 'int main()': main.cpp:94:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for(int i = 0; i < str.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp:104:41: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 104 | for(int i = a.size()-1, scad = 0; i < str.size(); i++, scad++){ | ~~^~~~~~~~~~~~