Well, since you said you're going to do this thousands of times...
use Inline C =>;
print UniqueCount("0101010101"), "\n";
print UniqueCount("1234567812"), "\n";
__END__
__C__
int UniqueCount(unsigned char *str) {
char counts[256];
int i;
int result;
/* clear the array */
for (i = 0; i <= 255; i++) {
counts[i] = (char) 0;
}
/* notice the characters */
while (*str) {
counts[*str++] = 1;
}
/* now count the results */
result = 0;
for (i = 0; i <= 255; i++) {
result += counts[i];
}
return result;
}
Apologies for my rusty C... I've been coding in Perl too long (however, it worked on the first compile!).
-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.
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