I think the style should be avoided; code shouldn't be compact and variable names should be descriptive.

Artificial example:

    for( int i = 0 ; i < c+j ; i += b )

should be:

    for( int count = 0 ; count < sum+extra ; count += skip )

It may be allowed to use i in place of count here, but this is the only place where single name variables should be permitted and only if i is really just a simple array index iterator.