Compilare: user.cpp: In function ‘void redirectInput(const char*, const char*)’: user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void buildMatchTable(std::vector<int, std::allocator<int> >&, std::string&)’: user.cpp:30: warning: comparison between signed and unsigned integer expressions