roua.cpp: In member function 'int BigInteger::GetIndex(int)': roua.cpp:39: warning: comparison between signed and unsigned integer expressions roua.cpp: In member function 'void BigInteger::Sum(BigInteger)': roua.cpp:74: warning: comparison between signed and unsigned integer expressions roua.cpp: In function 'int main()': roua.cpp:112: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result roua.cpp:113: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result roua.cpp:115: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result roua.cpp:116: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result roua.cpp:120: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result