Compilare: user.cpp: In member function ‘HugeN HugeN::operator+(const HugeN&)’: user.cpp:42:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans.x[++ans.x[0]] = 1; ^ user.cpp: In member function ‘HugeN HugeN::operator-(const HugeN&)’: user.cpp:60:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (ans.x[0] > 1 && ans.x[ans.x[0]] == 0) ^ user.cpp: In function ‘int main()’: user.cpp:77:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm6.in", "r", stdin); ^ user.cpp:78:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm6.out", "w", stdout); ^ user.cpp:80:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^