Re: Compute Unique Numbers in a Set

From	Bart <bc@freeuk.com>
Newsgroups	comp.lang.c, comp.lang.c++
Subject	Re: Compute Unique Numbers in a Set
Date	2023-01-08 17:34 +0000
Organization	Aioe.org NNTP Server
Message-ID	<tpeurf$15ot$1@gioia.aioe.org> (permalink)
References	(1 earlier) <tpdas0$3oa34$1@dont-email.me> <tpdef6$2a759$1@news.xmission.com> <tpdfp6$3osch$1@dont-email.me> <tpdim3$3p3kb$1@dont-email.me> <tpel4n$ivd$1@gioia.aioe.org>

Cross-posted to 2 groups.

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On 08/01/2023 14:48, Bart wrote:
> On 08/01/2023 05:01, Bonita Montero wrote:
>> Now it's perfect:
>>
>> <snip complicated C++ code>>

> That's some torturous-looking code.

I tested your [BM] code for speed, using N=1000000, and limits of 1..N+1.

The 'cout' in the loop was replaced with a count of all the values, so 
that at the end the total was displayed to be able to compare results.

The C++ with gcc-O3 took 1.25 seconds.

My script initially took much longer due to using an unordered list 
(storing up to 1M values). But I tweaked it use a bit-set.

Then it took 0.67 seconds.

(Revised script:)
>      a:=new(set,lower..upper)
>      sum:=0

>      to n do
>          repeat
>              x:=random(lower..upper)
>          until x not in a
>          a[x]:=1
 >          sum+:=x
>      od

Thread

Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-08 06:01 +0100
  Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-08 14:48 +0000
    Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-08 18:22 +0100
      Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-08 17:46 +0000
        Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-09 04:58 +0100
          Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-09 11:26 +0000
            Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-09 15:57 +0100
    Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-08 17:34 +0000
      Re: Compute Unique Numbers in a Set Ike Naar <ike@sdf.org> - 2023-01-08 21:45 +0000
        Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-08 23:13 +0000
          Re: Compute Unique Numbers in a Set "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-08 15:18 -0800
            Re: Compute Unique Numbers in a Set Tim Woodall <news001@woodall.me.uk> - 2023-01-13 06:35 +0000
              Re: Compute Unique Numbers in a Set Tim Woodall <news001@woodall.me.uk> - 2023-01-13 06:39 +0000
  Re: Compute Unique Numbers in a Set Paavo Helde <eesnimi@osa.pri.ee> - 2023-01-08 21:19 +0200
  Re: Compute Unique Numbers in a Set Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-01-08 19:20 +0000
  Re: Compute Unique Numbers in a Set "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2023-01-09 12:03 +0100
    Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-09 17:42 +0100
      Re: Compute Unique Numbers in a Set Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-01-09 23:22 +0000
      Re: Compute Unique Numbers in a Set Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2023-01-10 05:11 -0800
        Re: Compute Unique Numbers in a Set Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2023-01-10 05:19 -0800
      Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-13 08:26 +0100
        Re: Compute Unique Numbers in a Set Öö Tiib <ootiib@hot.ee> - 2023-01-13 03:26 -0800
        Re: Compute Unique Numbers in a Set gazelle@shell.xmission.com (Kenny McCormack) - 2023-01-13 12:21 +0000
          Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-13 14:11 +0100
            Re: Compute Unique Numbers in a Set gazelle@shell.xmission.com (Kenny McCormack) - 2023-01-13 13:55 +0000
              Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-13 15:02 +0100
                Re: Compute Unique Numbers in a Set gazelle@shell.xmission.com (Kenny McCormack) - 2023-01-13 14:17 +0000
        Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-15 16:06 +0100
          Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-15 16:47 +0100
            Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-15 17:13 +0100
            Re: Compute Unique Numbers in a Set Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2023-01-15 08:57 -0800
              Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-16 09:46 +0100
                Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-16 10:21 +0100
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-16 13:35 +0100
                Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-16 14:46 +0100
                Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-16 14:42 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-16 16:38 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-16 21:06 +0100
                Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-17 09:19 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-17 09:30 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-17 14:14 +0100
                Re: Compute Unique Numbers in a Set Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2023-01-17 07:48 -0800
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-17 16:49 +0100
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-17 17:32 +0100
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-17 19:24 +0100
                Re: Compute Unique Numbers in a Set Ralf Goertz <me@myprovider.invalid> - 2023-01-17 17:31 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-17 17:10 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-17 18:18 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 09:23 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-18 13:31 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 16:16 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-18 17:20 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 16:24 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-18 17:59 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 17:14 +0000
                Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-18 18:23 +0100
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-19 09:31 +0000
                Re: Compute Unique Numbers in a Set "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-17 12:48 -0800
                Re: Compute Unique Numbers in a Set scott@slp53.sl.home (Scott Lurndal) - 2023-01-17 21:21 +0000
                Re: Compute Unique Numbers in a Set "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-17 13:29 -0800
                Re: Compute Unique Numbers in a Set Paul N <gw7rib@aol.com> - 2023-01-18 06:50 -0800
                Re: Compute Unique Numbers in a Set "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-18 11:59 -0800
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-17 16:25 +0000
                Re: Compute Unique Numbers in a Set Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2023-01-17 09:08 -0800
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-17 17:16 +0000
                Re: Compute Unique Numbers in a Set Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-01-17 17:32 +0000
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 09:23 +0000
                Re: Compute Unique Numbers in a Set gazelle@shell.xmission.com (Kenny McCormack) - 2023-01-18 12:26 +0000
                Re: Compute Unique Numbers in a Set Muttley@dastardlyhq.com - 2023-01-18 16:09 +0000
          Re: Compute Unique Numbers in a Set Bart <bc@freeuk.com> - 2023-01-15 16:27 +0000
            Re: Compute Unique Numbers in a Set Bonita Montero <Bonita.Montero@gmail.com> - 2023-01-15 17:42 +0100
          Re: Compute Unique Numbers in a Set gazelle@shell.xmission.com (Kenny McCormack) - 2023-01-15 17:11 +0000
  Re: Compute Unique Numbers in a Set Tim Woodall <news001@woodall.me.uk> - 2023-01-13 06:32 +0000
    Re: Compute Unique Numbers in a Set Öö Tiib <ootiib@hot.ee> - 2023-01-13 05:04 -0800

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