subsir.cpp: In function 'void dx(int)': subsir.cpp:18: warning: comparison between signed and unsigned integer expressions subsir.cpp: In function 'void dy(int)': subsir.cpp:39: warning: comparison between signed and unsigned integer expressions subsir.cpp: In function 'int main()': subsir.cpp:56: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result subsir.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result subsir.cpp:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result subsir.cpp:62: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result