expand.cpp: In function 'bool match(const std::string&, int, const std::string&)': expand.cpp:12: warning: comparison between signed and unsigned integer expressions expand.cpp: In function 'int main()': expand.cpp:43: warning: comparison between signed and unsigned integer expressions expand.cpp:44: warning: comparison between signed and unsigned integer expressions expand.cpp:51: warning: comparison between signed and unsigned integer expressions expand.cpp:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result expand.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result