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看下面的discuss

Posted by frkstyc at 2005-07-28 14:22:04 on Problem 2495
In Reply To:糊里糊涂的就过了,谁能帮忙解释一下啊... Posted by:zdker at 2005-07-28 14:09:10
> readln(a,b,c,d);
> if odd(c+d-a-b)
>   then writeln('1')
>   else writeln('0');

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