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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# ch-2.pl Perl Weekly Challenge Week 207 Task 2 H-Index
#=============================================================================
# Copyright (c) 2023, Bob Lied
#=============================================================================
# You are given an array of integers containing citations a researcher has
# received for each paper.
# Write a script to compute the researcher’s H-Index. For more information
# please checkout the wikipedia page. https://en.wikipedia.org/wiki/H-index
#
# The H-Index is the largest number h such that h articles have at least h
# citations each. For example, if an author has five publications, with 9, 7,
# 6, 2, and 1 citations (ordered from greatest to least), then the author’s
# h-index is 3, because the author has three publications with 3 or more
# citations. However, the author does not have four publications with 4 or
# more citations.
#
# Example 1 Input: @citations = (10,8,5,4,3) Output: 4
# Because the 4th publication has 4 citations and the 5th has only 3.
# Example 2 Input: @citations = (25,8,5,3,3) Output: 3
# The H-Index is 3 because the fourth paper has only 3 citations.
#
# What this amounts to is finding the largest i in a sorted array such
# that x[i] >= i
#=============================================================================
use v5.36;
use List::Util qw/first/;
use Getopt::Long;
my $Verbose = 0;
my $DoTest = 0;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
exit(!runTest()) if $DoTest;
say H_index( @ARGV );
sub H_index(@cite)
{
my @sorted = sort { $b <=> $a } @cite;
my $h = first { $sorted[$_] < $_+1 } 0 .. $#sorted;
return $h;
}
sub runTest
{
use Test2::V0;
is( H_index(10,8,5,4,3), 4, "Example 1");
is( H_index(25,8,5,3,3), 3, "Example 2");
is( H_index( 1,1,1,1,1), 1, "Example 2");
done_testing;
}
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