plusMinus([-3, -5, 6, 7, 0, 0, 2, 4, -5, 3]);
//plusMinus([2 ,1,0, 0, 0, -6 ,-4, 10, 3, -7])."\n\n";
//plusMinus([1, 2, -6, -3, 8, 0 , 0, 1,-9, 4])."\n\n";


//calculate a ratio of positive, negative and 0 numbers in array
function plusMinus($arr){
	$r=[0,0,0];
	
	foreach ($arr as $item){
		if ($item>0){
			$r[0]++;
		}else if ($item<0){
			$r[1]++;
		}else{
			$r[2]++;
		}
	}
	//number of items in entire array
	$s = count($arr);
    // Calculates each ratio and rounds the result to 6 digits
    $res = [round($r[0]/$s, 6), round($r[1]/$s, 6), round($r[2]/$s, 6)];
    
    echo $res[0] . "\n";
    echo $res[1] . "\n";
    echo $res[2] . "\n";
	
}