Compilare: user.cpp: In function ‘int main()’: user.cpp:137:7: warning: unused variable ‘pmax’ [-Wunused-variable] int pmax = 0; ^ user.cpp:158:32: 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:159:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < results.size(); ++i) { ^ user.cpp:115:50: 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:116:52: 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); ^