Compilare: main.cpp: In function 'int main()': main.cpp:11:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i=0; i<=s.length(); i++) { | ~^~~~~~~~~~~~ main.cpp:12:74: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | if(((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')) && i < s.length()) { | ~~^~~~~~~~~~~~