Compilare: main.cpp: In function 'int cost(const string&, const string&)': main.cpp:46:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | while(j<b.length()){ | ~^~~~~~~~~~~ main.cpp:67:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | while(i<a.length()){ | ~^~~~~~~~~~~