Compilare: user.cpp: In function ‘int main()’: user.cpp:77:51: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((file_input + ".in").c_str(), "r", stdin); ^ user.cpp:78:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((file_input + ".out").c_str(), "w", stdout); ^ user.cpp:87:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s", word, text); ^