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vanbrabantf/Binary4.php

Created April 2, 2021 14:24
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Binary4.php
<?php
public function invert(?Node $tree): ?Node
{
if ($tree === null) {
return null;
}
$right = $this->invert($tree->getLeft());
$left = $this->invert($tree->getRight());
return new Node($tree->getValue(), $left, $right);
}
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