nkbiti.cpp: In member function 'void Matrix::set(int, int, int)': nkbiti.cpp:23: warning: comparison between signed and unsigned integer expressions nkbiti.cpp:23: warning: comparison between signed and unsigned integer expressions nkbiti.cpp: In member function 'int Matrix::get(int, int)': nkbiti.cpp:29: warning: comparison between signed and unsigned integer expressions nkbiti.cpp:29: warning: comparison between signed and unsigned integer expressions nkbiti.cpp: In function 'int main()': nkbiti.cpp:77: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nkbiti.cpp:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nkbiti.cpp:82: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result