Compilare: user.cpp: In function ‘void big_add(num&, const num&)’: user.cpp:17: warning: array subscript has type ‘char’ user.cpp:17: warning: array subscript has type ‘char’ user.cpp:17: warning: array subscript has type ‘char’ user.cpp: In function ‘void solve(int, int)’: user.cpp:28: warning: array subscript has type ‘char’ user.cpp:29: warning: array subscript has type ‘char’ user.cpp:35: warning: array subscript has type ‘char’ user.cpp:35: warning: array subscript has type ‘char’ user.cpp:35: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:43: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result