/in/foo.cc: In function 'int main()':
/in/foo.cc:8:28: error: array size in new-expression must be constant
     char *s = new char[m][n];
                            ^
/in/foo.cc:8:28: error: the value of 'n' is not usable in a constant expression
/in/foo.cc:6:11: note: 'int n' is not const
     int m,n;
           ^
/in/foo.cc:13:26: error: invalid types 'char[int]' for array subscript
             cin >> s[i][j];
                          ^