pack.cpp: In function 'int match(int)': pack.cpp:45: warning: comparison between signed and unsigned integer expressions pack.cpp: In function 'int main()': pack.cpp:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pack.cpp:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pack.cpp:73: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pack.cpp:75: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pack.cpp:77: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pack.cpp:79: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result