Compilare: main.cpp: In function 'int cost(const string&, const string&)': main.cpp:48:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while(j<b.length()){ | ~^~~~~~~~~~~ main.cpp:69:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | while(i<a.length()){ | ~^~~~~~~~~~~ main.cpp:74:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | if(j==b.length()) | ~^~~~~~~~~~~~ main.cpp:66:6: warning: unused variable 'result' [-Wunused-variable] 66 | int result = 0; | ^~~~~~ main.cpp: In function 'void compute_distances()': main.cpp:95:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | if(dist[i][k] == v[k].length()){ | ~~~~~~~~~~~^~~~~~~~~~~~~~~~