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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given an array of distinct integers.
+Write a script to find all pairs of elements with minimum absolute difference (MAD) of any two elements.
+
+Example 1
+
+Input: @ints = (4, 1, 2, 3)
+Output: [1,2], [2,3], [3,4]
+
+The minimum absolute difference is 1.
+Pairs with MAD: [1,2], [2,3], [3,4]
+
+
+Example 2
+
+Input: @ints = (1, 3, 7, 11, 15)
+Output: [1,3]
+
+
+Example 3
+
+Input: @ints = (1, 5, 3, 8)
+Output: [1,3], [3,5]
+
+
+=cut
+
+
+use Test2::V0 -no_srand => 1;
+
+is([min_abs_diff(4, 1, 2, 3)], [[1,2], [2,3], [3,4]], 'Example 1');
+is([min_abs_diff(1, 3, 7, 11, 15)], [[1,3]], 'Example 2');
+is([min_abs_diff(1, 5, 3, 8)], [[1,3], [3,5]], 'Example 3');
+done_testing();
+
+
+
+sub min_abs_diff
+{
+     my @arr = @_;
+     @arr = sort { $a <=> $b } @arr;
+     my @output; 
+     my $min_diff = ~0+1;
+     for my $idx ( 0 .. $#arr-1 )
+     {
+          if ( ($arr[$idx+1] - $arr[$idx]) < $min_diff )
+          {
+               @output = ();
+               push @output, [$arr[$idx], $arr[$idx+1]];
+               $min_diff = $arr[$idx+1] - $arr[$idx]
+          }
+          elsif (($arr[$idx+1] - $arr[$idx]) == $min_diff)
+          {
+               push @output, [$arr[$idx], $arr[$idx+1]];
+          }
+     }
+     return @output;
+}