Compilare: user.cpp: In function ‘void read()’: user.cpp:72:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "avioane2.in" , "r" , stdin ) ; ^ user.cpp:73:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d %d" , &N , &M , &K ) ; ^ user.cpp:78:103: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d %d %d %d" , &from , &X.time_come , &X.destination , &X.time_arrive , &X.cost ) ; ^ user.cpp:84:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d" , &destination , &max_time ) ; ^