Compilare: user.cpp: In member function ‘Huge Huge::operator+(const Huge&) const’: user.cpp:76:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (register int i = 0; i < aux.size() || i < other.size() || t != 0; ++ i) { ^ user.cpp:77:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == aux.size()) ^ user.cpp: In member function ‘Huge Huge::operator-(const Huge&) const’: user.cpp:120:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (register int i = 0; i < aux.size(); ++ i) { ^ user.cpp: In member function ‘bool Huge::operator==(const Huge&) const’: user.cpp:139:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v.size() != other.size()) ^ user.cpp:142:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (register int i = 0; i < v.size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:228:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("doi.in", "r", stdin); ^ user.cpp:229:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("doi.out", "w", stdout); ^