4.php

<?php

/*
 * Complete the 'plusMinus' function below.
 *
 * The function accepts INTEGER_ARRAY arr as parameter.
 */

function getStat($number, $total) {
    $result = $number / $total;
    return number_format($result, 6, '.', '');
}

function plusMinus($arr) {
    // Write your code here
    $stats['positives'] = 0;
    $stats['negatives'] = 0;
    $stats['zero']= 0;
    $length = count($arr);
    
    foreach($arr as $item) {
        if ($item > 0) {
            ++$stats['positives'];
        } elseif($item == 0) {
            ++$stats['zero'];
        } else {
            ++$stats['negatives'];
        }
    }
    foreach($stats as $k => $v) {
        echo  getStat($v, $length) . PHP_EOL;
    }
    
    
}

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

$arr_temp = rtrim(fgets(STDIN));

$arr = array_map('intval', preg_split('/ /', $arr_temp, -1, PREG_SPLIT_NO_EMPTY));

plusMinus($arr);