XOR Swap
PHP
Hard
4 views
Problem Description
You get a and b. Swap using XOR trick and print swapped.
Input Format
One line: a b.
Output Format
One line swapped.
Official Solution
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
[$a,$b]=array_map('intval',preg_split('/\\s+/', $inputText));
$a=$a^$b; $b=$a^$b; $a=$a^$b;
echo $a.' '.$b;
?>
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