#!/usr/bin/perl
use warnings;
use strict;

use List::Util 'shuffle';

my @random;
LOOP: {
    @random = shuffle 0 .. 99;
    my %unique;
    for ( 0 .. $#random ) {
        redo LOOP if $_ == $random[ $_ ] || ++$unique{ $_ < $random[ $
+_ ] ? "$_,$random[$_]" : "$random[$_],$_" } > 1;
        }
    }

my @pairs = map [ $_, $random[ $_ ] ], 0 .. $#random;

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In reply to Re: random pairs by jwkrahn
in thread random pairs by Anonymous Monk

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