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priyanka-and-toys.php

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<?php

/*

* Complete the 'toys' function below.

*

* The function is expected to return an INTEGER.

* The function accepts INTEGER_ARRAY w as parameter.

*/

function toys($w)

{

sort($w);

$min = $w[0];

$count = 1;

for ($x = 1, $l = count($w); $x < $l; $x++) {

if ($w[$x] <= $min + 4) {

continue;

}

$min = $w[$x];

$count++;

}

return $count;

}

$fptr = fopen(getenv("OUTPUT_PATH"), "w");

$n = intval(trim(fgets(STDIN)));

$w_temp = rtrim(fgets(STDIN));

$w = array_map('intval', preg_split('/ /', $w_temp, -1, PREG_SPLIT_NO_EMPTY));

$result = toys($w);

fwrite($fptr, $result . "\n");

fclose($fptr);