Compilare: user.cpp: In function ‘int is_eu()’: user.cpp:37: warning: the address of ‘int is_connected()’ will always evaluate as ‘true’ user.cpp: In function ‘int solve()’: user.cpp:75: warning: unused variable ‘q’ user.cpp: In function ‘int main()’: user.cpp:85: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:86: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:88: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:92: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result