trains.cpp:92: warning: integer constant is too large for 'long' type trains.cpp: In function 'void read()': trains.cpp:108: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp:120: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp: In function 'void write()': trains.cpp:131: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp:132: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp:135: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp:142: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trains.cpp:146: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result