ozn.cpp: In function 'int main()': ozn.cpp:116: warning: comparison between signed and unsigned integer expressions ozn.cpp:98: warning: unused variable 'j' ozn.cpp:99: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ozn.cpp:100: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ozn.cpp:101: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ozn.cpp:105: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ozn.cpp:109: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result