Compilare: main.cpp: In function 'int main()': main.cpp:89:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | for(int i = 0; i < file_names.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:98:21: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wformat=] 98 | fprintf(fout, "%d\n", paths.size()); | ~^ ~~~~~~~~~~~~ | | | | int std::vector<std::__cxx11::basic_string<char> >::size_type {aka long unsigned int} | %ld main.cpp:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for(int i = 0; i < paths.size(); i++) { | ~~^~~~~~~~~~~~~~