Compilare: user.cpp: In member function ‘void LargeNumber::operator+=(const LargeNumber&)’: user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v.size() > i) ans[i] += v[i]; ^ user.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (u.size() > i) ans[i] += u[i]; ^ user.cpp: In member function ‘void LargeNumber::operator*=(const LargeNumber&)’: user.cpp:35:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ^ user.cpp:36:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < u.size(); ++j) ^ user.cpp:39:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:74:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard3.in", "r", stdin); ^ user.cpp:75:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gard3.out", "w", stdout); ^