/in/foo.cc: In function 'void print(long long int)':
/in/foo.cc:53:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   53 | while (x) a[++a[0]] = x%10,x/=10;
      |             ^~~~~~
/in/foo.cc:55:14: warning: array subscript has type 'char' [-Wchar-subscripts]
   55 | putchar(a[a[0]]+48);
      |           ~~~^