smith.cpp: In function 'int gene(int)': smith.cpp:25: warning: unused variable 'd' smith.cpp: In function 'int main()': smith.cpp:73: warning: unused variable 't' smith.cpp:73: warning: unused variable 'z' smith.cpp:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smith.cpp:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smith.cpp:75: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result smith.cpp:76: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result