pesti.cpp: In function 'int cautazi(int)': pesti.cpp:7: warning: comparison between signed and unsigned integer expressions pesti.cpp: In function 'int main()': pesti.cpp:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pesti.cpp:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pesti.cpp:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result