Compilare: user.cpp: In function ‘int main()’: user.cpp:31: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ‘ret’ may be used uninitialized in this function user.cpp:16: warning: ‘aux’ may be used uninitialized in this function