asmax.cpp: In function 'int main()': asmax.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result asmax.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result asmax.cpp: In function 'void ReadData()': asmax.cpp:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result asmax.cpp:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result asmax.cpp:64: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result