/in/foo.cc: In function 'int digit(long long int, int)':
/in/foo.cc:11:9: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return t;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:16:8: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<ans<<endl;
        ^~~