list($x, $y, $dummy) = explode(",", $strStdin, 3);
$arrDataset[] = array("x" => floatval($x), "y" => floatval($y));
}
// get the number of datasets
$maxN = $arrDataset[0]["x"];
// remove the first element from the array
array_splice($arrDataset, 0, 1);
// remove the last element from the array
array_pop($arrDataset);
reset($arrDataset);
if (0 < $maxN) {
for ($i = 0; $i <= $maxN - 2; $i++) {
$wkAns = 1;
for ($j = $i + 1; $j <= $maxN - 1; $j++) {
$dist = new dist();
$dist->setCenterPointA($arrDataset[$i]["x"], $arrDataset[$i]["y"]);
$dist->setCenterPointB($arrDataset[$j]["x"], $arrDataset[$j]["y"]);
if (NUM_DIST >= $dist->getDist()) {
$wkAns++;
}
}
if ($wkAns > $ans) {
$ans = $wkAns;
}
}
} else {
$ans = 0;
}
// output answer to stdout
fwrite(STDOUT, "Ans:" . $ans . PHP_EOL);
class dist
