Compilare: user.cpp: In function ‘int main()’: user.cpp:24:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:20:33: 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:21:38: 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); ^