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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2025, Bob Lied
#=============================================================================
# ch-1.pl Perl Weekly Challenge 334 Task 1 Range Sum
#=============================================================================
# You are given a list integers and pair of indices. Write a script
# to return the sum of integers between the given indices (inclusive).
# Example 1 Input: @ints = (-2, 0, 3, -5, 2, -1), $x = 0, $y = 2
# Output: 1
# Example 2 Input: @ints = (1, -2, 3, -4, 5), $x = 1, $y = 3
# Output: -3
# Example 3 Input: @ints = (1, 0, 2, -1, 3), $x = 3, $y = 4
# Output: 2
# Example 4 Input: @ints = (-5, 4, -3, 2, -1, 0), $x = 0, $y = 3
# Output: -2
# Example 5 Input: @ints = (-1, 0, 2, -3, -2, 1), $x = 0, $y = 2
# Output: 1
#=============================================================================
use v5.42;
use Getopt::Long;
my $DoTest = false;
my $X;
my $Y;
GetOptions("test" => \$DoTest, "x:i" => \$X, "y:i" => \$Y);
my $logger;
{
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init({ level => $DEBUG,
layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
$logger = Log::Log4perl->get_logger();
}
#=============================================================================
exit(!runTest()) if $DoTest;
$X //= 0;
$Y //= $#ARGV;
say rangeSum($X, $Y, \@ARGV);
#=============================================================================
sub rangeSum($x, $y, $ints)
{
use List::Util qw/sum0/;
if ( $x > $y ) { ($x, $y) = ($y, $x) }
return sum0 map { $_ // 0 } $ints->@[$x .. $y];
}
sub runTest
{
use Test2::V0;
is( rangeSum(0,2, [-2, 0, 3, -5, 2, -1] ), 1, "Example 1");
is( rangeSum(1,3, [1,-2,3,-4,,5 ] ), -3, "Example 2");
is( rangeSum(3,4, [1,0,2,-1,3 ] ), 2, "Example 3");
is( rangeSum(0,3, [-5,4,-3,2,-1,0 ] ), -2, "Example 4");
is( rangeSum(0,2, [-1,0,3,-3,-2,1 ] ), 2, "Example 5");
is( rangeSum(0,0, [ 9,0,3,-3,-2,1 ] ), 9, "Singleton");
is( rangeSum(1,9, [ 0 ] ), 0, "Out of range");
is( rangeSum(1,9, [ 0,1,2,3 ] ), 6, "Partial range");
is( rangeSum(3,2, [ 0,1,2,3 ] ), 5, "Backwards?");
done_testing;
}
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