Compilare: main.cpp: In function 'int parse()': main.cpp:115:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | while (i < s.size()) { | ~~^~~~~~~~~~ main.cpp:123:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 123 | while (cif(s[i]) && i < s.size()) { | ~~^~~~~~~~~~