Solutions for challenge 351

challenge-351/matt-martini/README

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+Solution by Matt Martini

challenge-351/matt-martini/perl/ch-1.pl

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+#!/usr/bin/env perl
+
+# You are given an array of integers.
+# Write a script to return the average excluding the minimum and maximum
+# of the given array.
+
+use 5.018;
+use strict;
+use warnings;
+use Test2::V0;
+use List::Util qw(min max sum0);
+
+plan tests => 5;
+
+sub special_average {
+    my (@ints) = @_;
+
+    print 'Input: @ints = (' . join( ', ', @ints ) . ")\n";
+
+    my $min = min @ints;
+    my $max = max @ints;
+
+    @ints = grep { !/$min|$max/ } @ints;
+
+    my $sum     = sum0 @ints;
+    my $count   = scalar @ints || 1;
+    my $average = $sum / $count;
+
+    say 'Output: ' . $average;
+
+    # say 'Min ' . $min;
+    # say 'Max ' . $max;
+    # say 'Avg ' . $average;
+
+    return $average;
+}
+
+is( special_average( ( 8000, 5000, 6000, 2000, 3000, 7000 ) ),
+    5250, 'example 1' );
+is( special_average( ( 100_000, 80_000, 110_000, 90_000 ) ),
+    95_000, 'example 2' );
+is( special_average( ( 2500, 2500, 2500, 2500 ) ), 0, 'example 3' );
+is( special_average( (2500) ),                     0, 'example 4' );
+is( special_average( ( 1000, 2000, 3000, 4000, 5000, 6000 ) ),
+    3500, 'example 5' );

challenge-351/matt-martini/perl/ch-2.pl

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+#!/usr/bin/env perl
+
+# You are given an array of numbers.
+# Write a script to return true if the given array can be re-arranged
+# to form an arithmetic progression, otherwise return false.
+
+#     A sequence of numbers is called an arithmetic progression if the
+#     difference between any two consecutive elements is the same.
+
+use 5.018;
+use strict;
+use warnings;
+use Test2::V0;
+
+plan tests => 5;
+
+sub arithmetic_progression {
+    my (@num) = @_;
+    print 'Input: @num = (' . join( ', ', @num ) . ")\n";
+
+    @num = sort { $a <=> $b } @num;
+    my $diff = $num[1] - $num[0];
+
+    my $result = 'true';
+    COMPARE:
+    foreach ( my $i = 1; $i <= $#num; $i++ ) {
+        if ( $num[ $i - 1 ] + $diff != $num[$i] ) {
+            $result = 'false';
+            last COMPARE;
+        }
+    }
+
+    say 'Output: ' . $result;
+    return $result;
+}
+
+is( arithmetic_progression( ( 1,    3, 5, 7,   9 ) ),  'true',  'example 1' );
+is( arithmetic_progression( ( 9,    1, 7, 5,   3 ) ),  'true',  'example 2' );
+is( arithmetic_progression( ( 1,    2, 4, 8,   16 ) ), 'false', 'example 3' );
+is( arithmetic_progression( ( 5,   -1, 3, 1,   -3 ) ), 'true',  'example 4' );
+is( arithmetic_progression( ( 1.5,  3, 0, 4.5, 6 ) ),  'true',  'example 5' );