Compilare: main.cpp: In function 'int compare(int, std::__cxx11::string&, std::__cxx11::string&)': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size (); i++) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("seti.in", "r", stdin); ^ main.cpp:60:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("seti.out", "w", stdout); ^