Compilare: main.cpp: In function 'int main()': main.cpp:12:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "tribute.in" , "r" , stdin ) ; ^ main.cpp:13:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "tribute.out" , "w" , stdout ) ; ^ main.cpp:17:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%lld%lld%lld" , & n , & d1 , & d2 ) ; ^ main.cpp:21:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%lld%lld" , & x , & y ) ; ^