howcome hashing will result in wrong output..??

if(isHashed(str[i])
{
     character found.
    break.
}
else
      hash(str[i]);

On Fri, Jun 8, 2012 at 2:15 PM, himanshu kansal <himanshukansal...@gmail.com
> wrote:

> how can we find 1st repeating character in string???
> e.g. if the string is "abba" it should return 'b' and not 'a'.....
>
> note: hashing will give the answer as 'a'....
>
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