Compilare: user.cpp: In member function ‘void LargeNumber::operator+=(const LargeNumber&)’: user.cpp:20:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < max(v.size(), u.size()); ++i) { ^ user.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v.size() > i) ans[i] += v[i]; ^ user.cpp:22:19: 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:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ^ user.cpp:35:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < u.size(); ++j) ^ user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i) { ^ user.cpp:46:28: 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:79:33: 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:80:35: 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); ^ user.cpp:82:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^