Compilare: main.cpp:45:8: warning: first argument of 'int main(long long int, const char**)' should be 'int' [-Wmain] signed main(int argc, char const *argv[]) { ^~~~ main.cpp: In function 'int main(long long int, const char**)': main.cpp:49:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ main.cpp:50:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^