(pseudocode because my perl has become rusty and i would probably get the syntax wrong) use an array $d[0] to d9, set all elements to 0; loop over digits in string: if ( $d$_ ) return 0; $d$_ = 1; # should be faster then adding 1 return 1;

In reply to Re: Determining uniqueness in a string. by Anonymous Monk
in thread Determining uniqueness in a string. by Yzzyx

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