Lots and Lots of Integers!: Weekly Challenge #320
Welcome to Weekly Challenge #320! This week’s title is inspired by a video my child used to watch, Lots and Lots of Jets and Planes!
Task 1: Maximum Count
Submitted by: Mohammad Sajid Anwar You are given an array of integers.
Write a script to return the maximum between the number of positive and negative integers. Zero is neither positive nor negative.
Let’s Talk About It
We get the count of positive and negative integers in a functional way. grep allows us to strip out the integers we want, and scalar gives us a count, rather than the values. Then I use a ternary operator to determinte whether the count of positive integers are highter than the count of negative integers, and return the higher count.
Show Me The Code!
#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say state postderef signatures };
my @examples = (
[ -3, -2, -1, 1, 2, 3 ],
[ -2, -1, 0, 0, 1 ],
[ 1, 2, 3, 4 ],
);
for my $example (@examples) {
my $str = join ', ', $example->@*;
my $output = max_count( $example->@* );
say <<"END";
Input: \$str = ($str)
Output: $output
END
}
sub max_count(@ints) {
my $pos = scalar grep { $_ > 0 } @ints;
my $neg = scalar grep { $_ < 0 } @ints;
return $pos > $neg ? $pos : $neg;
}
$ ./ch-1.pl
Input: $str = (-3, -2, -1, 1, 2, 3)
Output: 3
Input: $str = (-2, -1, 0, 0, 1)
Output: 2
Input: $str = (1, 2, 3, 4)
Output: 4
Task 2: Sum Difference
Submitted by: Mohammad Sajid Anwar
You are given an array of positive integers.Write a script to return the absolute difference between digit sum and element sum of the given array.
Let’s Talk About It
Because List::Util gives us sum0, I use that. (Again, I agree with sum0’s behavior, not that it matters for most uses.) I use map and split to separate integers into separate digits, and then subtraction and abs to finish the math.
Show Me The Code!
#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say state postderef signatures };
use List::Util qw{ sum0 };
my @examples = (
[ 1, 23, 4, 5 ],
[ 1, 2, 3, 4, 5 ],
[ 1, 2, 34 ],
);
for my $example (@examples) {
my $str = join ', ', $example->@*;
my $output = sum_diff( $example->@* );
say <<"END";
Input: \$str = ($str)
Output: $output
END
}
sub sum_diff (@ints) {
my $digit_sum = sum0 @ints;
my $element_sum = sum0 map { split //, $_ } @ints;
return abs $digit_sum - $element_sum;
}
$ ./ch-2.pl
Input: $str = (1, 23, 4, 5)
Output: 18
Input: $str = (1, 2, 3, 4, 5)
Output: 0
Input: $str = (1, 2, 34)
Output: 27
jacoby Bishop ~ win 320 $