downloads sample input/output data from acmicpc.net

get-input-output.pl

#!/usr/bin/env perl
#
# get-input-output.pl - downloads sample input/output data from acmicpc.net
#
# Downloads sample input/output data from Baekjoon Online Judge (acmicpc.net).
#
# Seungwon Jeong <seungwon0@gmail.com>
#
# Copyright (C) 2013 by Seungwon Jeong
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.

use perl5i::2;

use IO::All;

if ( @ARGV != 1 ) {
    say "Usage: $PROGRAM_NAME PROBLEM_NUMBER";
    exit 2;
}

my $problem_number = $ARGV[0];
$problem_number =~ tr/0-9//cd;

my $base_url = 'http://www.acmicpc.net/problem/';

my $document < io $base_url . $problem_number;

my $pattern = qr{<div [ ] class [ ] = [ ] "sampledata" > ( .*? ) </div>}xms;

my ( $input, $output ) = $document =~ /$pattern/g;

# Use Unix new line
$input  =~ s/\r\n/\n/g;
$output =~ s/\r\n/\n/g;

$input > io 'input';
$output > io 'output';