Compilare: main.cpp: In function 'bool done()': main.cpp:29:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i = 1; i < fi.length(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 1; i < en.length(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:58:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i = 0; i < fiV.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:13:12: warning: control reaches end of non-void function [-Wreturn-type] 13 | string fi; | ^~