You made me curious, so I tested the algorithm I proposed and came up with these results: 
100 Lines, 30 Questions
Benchmark: timing 5000 iterations of test_archon, test_jcwren, test_lu
+cs, test_lucsjcwren, test_lucsjcwren2...
test_archon:  6 wallclock secs ( 5.40 usr +  0.00 sys =  5.40 CPU)
test_jcwren: 19 wallclock secs (17.80 usr +  0.02 sys = 17.82 CPU)
 test_lucs:  7 wallclock secs ( 6.30 usr +  0.00 sys =  6.30 CPU)
test_lucsjcwren:  6 wallclock secs ( 5.84 usr +  0.00 sys =  5.84 CPU)
test_lucsjcwren2:  6 wallclock secs ( 5.55 usr +  0.01 sys =  5.56 CPU
+)

500 Lines, 150 Questions
Benchmark: timing 5000 iterations of test_archon, test_jcwren, test_lu
+cs, test_lucsjcwren, test_lucsjcwren2...
test_archon: 28 wallclock secs (26.94 usr +  0.01 sys = 26.95 CPU)
test_jcwren: 93 wallclock secs (88.83 usr +  0.11 sys = 88.94 CPU)
 test_lucs: 32 wallclock secs (30.66 usr +  0.00 sys = 30.66 CPU)
test_lucsjcwren: 30 wallclock secs (28.46 usr +  0.02 sys = 28.48 CPU)
test_lucsjcwren2: 29 wallclock secs (26.97 usr +  0.03 sys = 27.00 CPU
+)

1000 Lines, 300 Questions
Benchmark: timing 5000 iterations of test_archon, test_jcwren, test_lu
+cs, test_lucsjcwren, test_lucsjcwren2...
test_archon: 58 wallclock secs (54.92 usr +  0.05 sys = 54.97 CPU)
test_jcwren: 189 wallclock secs (179.66 usr +  0.13 sys = 179.79 CPU)
 test_lucs: 66 wallclock secs (63.03 usr +  0.05 sys = 63.09 CPU)
test_lucsjcwren: 61 wallclock secs (58.53 usr +  0.05 sys = 58.58 CPU)
test_lucsjcwren2: 57 wallclock secs (54.80 usr +  0.05 sys = 54.85 CPU
+)

[download]
test_archon: 
sub test_archon
{
  my %numhash;
  for (1 .. $Max_Questions) {
    my $randnum = int(rand($Max_Lines) + 1);
    redo if exists ($numhash{$randnum});
    $numhash{$randnum} = 1;
  }
  return [keys (%numhash)];
}

[download]

Edit 2001-03-26 by tye to remove <pre>

In reply to Re: (jcwren) Re: Creating an array of unique numbers (Benchmarks!) by archon
in thread Creating an array of unique numbers by TStanley

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