Graafide läbimine

<?php
define("NL", "
", true);
$in=file('H:\djks1_108.in', FILE_IGNORE_NEW_LINES);
$firstLine=explode(' ', $in[0]);
$n=$firstLine[0];
$m=$firstLine[1];
$secondLine=explode(' ', $in[1]);
$from=$secondLine[0];
$to=$secondLine[1];
unset($in[0]);
unset($in[1]);
$kaidud=array();
$kaugus=array();
$kaugused=array();
foreach($in as $x) {
	$x=explode(' ', $x);
	$a=$x[0];
	$b=$x[1];
	$c=$x[2];
	if(!isset($kaugused[$a])) {
		$kaugused[$a]=array();
	}
	if(!isset($kaugused[$b])) {
		$kaugused[$b]=array();
	}
	$kaugused[$a][$b]=$c;
	$kaugused[$b][$a]=$c;
	$kaugused[$a][$a]=0;
	$kaugused[$b][$b]=0;
}
foreach($kaugused as $k=>$ka) {
	print $k.NL;
	foreach($ka as $key=>$value) {
		print '	'.$key.': '.$value.NL;
	}
}
print $from.NL;
print $to.NL;
kaugused($from);
function kaugused($from) {
	global $kaugus;
	global $kaugused;
	global $kaidud;
	$kaidud[$from]=true;
	$jarjekord=array();
	foreach($kaugused[$from] as $key=>$value) {
		if(!isset($kaidud[$key])) {
			array_push($jarjekord, $key);
		}
	}
	sort($jarjekord);
	var_dump($jarjekord);
}
?>