nrbinar.cpp: In function 'int main()': nrbinar.cpp:37: warning: unused variable 'i' nrbinar.cpp:37: warning: unused variable 'j' nrbinar.cpp:37: warning: unused variable 'current' nrbinar.cpp:37: warning: unused variable 'common' nrbinar.cpp:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nrbinar.cpp:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nrbinar.cpp:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result