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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given an array of positive integers having even elements.
+Write a script to to return the decompress list. To decompress, pick adjacent pair (i, j) and replace it with j, i times.
+
+Example 1
+
+Input: @ints = (1, 3, 2, 4)
+Output: (3, 4, 4)
+
+Pair 1: (1, 3) => 3 one time  => (3)
+Pair 2: (2, 4) => 4 two times => (4, 4)
+
+
+Example 2
+
+Input: @ints = (1, 1, 2, 2)
+Output: (1, 2, 2)
+
+Pair 1: (1, 1) => 1 one time  => (1)
+Pair 2: (2, 2) => 2 two times => (2, 2)
+
+
+Example 3
+
+Input: @ints = (3, 1, 3, 2)
+Output: (1, 1, 1, 2, 2, 2)
+
+Pair 1: (3, 1) => 1 three times => (1, 1, 1)
+Pair 2: (3, 2) => 2 three times => (2, 2, 2)
+
+=cut
+
+
+
+
+
+use Test2::V0 -no_srand => 1;
+
+is(decompressed_list(1, 3, 2, 4), [3, 4, 4], 'Example 1');
+is(decompressed_list(1, 1, 2, 2), [1, 2, 2], 'Example 1');
+is(decompressed_list(3, 1, 3, 2), [1, 1, 1, 2, 2, 2], 'Example 3');
+done_testing();
+
+sub decompressed_list
+{
+     my @arr = @_;
+     return 
+          [map { ($arr[$_ + 1]) x $arr[$_] } 
+          grep { $_ % 2 == 0 }
+          0 .. $#arr];
+}