Compilare: user.cpp: In function ‘int main()’: user.cpp:114:17: warning: unused variable ‘x’ [-Wunused-variable] int x; ^ user.cpp:109:14: warning: unused variable ‘bad’ [-Wunused-variable] bool bad = false; ^ user.cpp:27:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queries.in", "r", stdin); ^ user.cpp:28:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queries.out", "w", stdout); ^