Compilare: main.cpp: In function 'bool subsir(std::string, std::string)': main.cpp:23:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if (curr < a.size() && x == a[curr]) | ~~~~~^~~~~~~~~~ main.cpp:25:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | return curr == a.size(); | ~~~~~^~~~~~~~~~~ main.cpp: In function 'void bkt(std::string)': main.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~