Compilare: main.cpp: In function 'int main()': main.cpp:44:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | while (ind < s.size()) { | ~~~~^~~~~~~~~~ main.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | while (ind < s.size() && s[ind] >= 'a' && s[ind] <= 'z') { | ~~~~^~~~~~~~~~ main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while (ind < s.size() && s[ind] >= '0' && s[ind] <= '9') { | ~~~~^~~~~~~~~~