mat.cpp: In function 'int main()': mat.cpp:40: warning: comparison between signed and unsigned integer expressions mat.cpp:62: warning: comparison between signed and unsigned integer expressions mat.cpp:10: warning: unused variable 'maxim' mat.cpp:10: warning: unused variable 'nrap' mat.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mat.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mat.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mat.cpp:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result