Compilare: user.cpp: In function ‘void elimina_muchie(int, int)’: user.cpp:76:6: warning: unused variable ‘i’ [-Wunused-variable] int i = 0; ^ user.cpp: In function ‘int main()’: user.cpp:192:32: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘std::vector<std::basic_string<char> >::size_type {aka unsigned int}’ [-Wformat=] printf("%lu\n", results.size()); ^ user.cpp:193:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < results.size(); ++i) { ^ user.cpp:131:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:132:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^