Compilare: main.cpp: In function 'int cmp(std::string, std::string)': main.cpp:26:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | else for (int i = 0; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'int toint(std::string)': main.cpp:51:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (; index < a.size(); index++) | ~~~~~~^~~~~~~~~~