Compilare: main.cpp: In function 'int main()': main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int j=0; j<len(i); j++) | ^ main.cpp:39:60: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if(cost[dif + len(i)]==0 || cost[dif + len(i)] > c + len(i)) | ^ main.cpp:44:60: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | if(cost[dif - len(i)]==0 || cost[dif - len(i)] > c + len(i)) | ^