Compilare: main.cpp: In function 'int main()': main.cpp:25:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while (pos < str.size()) { | ~~~~^~~~~~~~~~~~ main.cpp:34:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | while (pos < str.size() && '0' <= str[pos] && str[pos] <= '9') { | ~~~~^~~~~~~~~~~~ main.cpp:42:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (pos >= str.size()) { | ~~~~^~~~~~~~~~~~~