<pre class="shiki github-dark shaku"><code>/** * @param {HTMLElement | null} root * @return {HTMLElement[]} */function flatten(root) { // your code here if(!root) return []; const result=[]; const queue = [root]; while(queue.length){ const node = queue.shift(); result.push(node); for(let i=0; i&lt;node.children.length; i++){ queue.push(node.children[i]); } } return result;}</code></pre>

This is my accepted solution

Amazon

Given a DOM tree, flatten it into an one dimensional array, in the order of layer by layer, like below. [https://cdn.bfe.dev/bfe/img/ykqFdOIOaXFyn2uZ8…