Compilare: main.cpp: In function 'bool exista_balbaiala(std::string&, int)': main.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | while (j < A.size() && A[j] != c) { | ~~^~~~~~~~~~ main.cpp:25:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if (j == A.size()) { | ~~^~~~~~~~~~~