Replace each element with product of every other element

EASY

Given an input string with numbers separated by a single space.

Replace each element of the string with product of every other element in the string.

For example, line "1 2 3"
New value instead "1" is "2 * 3 = 6". For "2" is "1 * 3 = 3". For "3" is "1 * 2 = 2"

Example #1

Input

1 2 3

Output

6 3 2

Solution

<?php
$line = trim(fgets(STDIN));
$nums = explode(' ', $line);

$product = null;
$productWithoutZero = null;
$zerosCount = 0;
foreach ($nums as $i => $num) {
    if ($product === null) {
        $product = $num;
    } else {
        $product *= $num;
    }
    if ($num == 0) {
        $zerosCount++;
        continue;
    }
    if ($productWithoutZero === null) {
        $productWithoutZero = $num;
    } else {
        $productWithoutZero *= $num;
    }
}
if ($zerosCount > 1) {
    $productWithoutZero = 0;
}

foreach ($nums as $i => $num) {
    if ($num == 0) {
        echo $productWithoutZero . ' ';
        continue;
    }
    echo $product / $num . ' ';
}

Tests

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