sir5.cpp: In function 'std::string transform(std::string)': sir5.cpp:14: warning: comparison between signed and unsigned integer expressions sir5.cpp:17: warning: comparison between signed and unsigned integer expressions sir5.cpp: In function 'int main()': sir5.cpp:64: warning: comparison between signed and unsigned integer expressions sir5.cpp:80: warning: comparison between signed and unsigned integer expressions sir5.cpp:85: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sir5.cpp:86: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sir5.cpp:88: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result