Compilare: user.cpp: In function ‘int main()’: user.cpp:13:23: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] long long a , b , x ; ^ user.cpp:14:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "tort.in" , "r" , stdin ) ; ^ user.cpp:15:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "tort.out" , "w" , stdout ) ; ^ user.cpp:16:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%lld %lld" , &a , &b ) ; ^