<pre class="shiki github-dark shaku"><code>/** * @param {number[][]} arrList * non-descending integer array * @return {number[]} */const sortByAsc = (a,b) =&gt; a - b;function merge(arrList = []) { // bf // 1. merge all of them // 2. sort by asc // const flattend = arrList.reduce((flattend, array) =&gt; { // return flattend.concat(array); // }, []); // return flattend.sort(sortByAsc); // merged two sorted arrays const mergeSortedArrays = (arrayA, arrayB) =&gt; { const merged = []; while (arrayA.length &amp;&amp; arrayB.length) { const eleA = arrayA[0]; const eleB = arrayB[0]; if (eleA &lt; eleB) { merged.push(arrayA.shift()); } else { merged.push(arrayB.shift()); } } // either arrayA or arrayB can have reminders if (arrayA.length) { merged.push(...arrayA); } if (arrayB.length) { merged.push(...arrayB); } return merged; } let merged = [] for (const array of arrList) { merged = mergeSortedArrays(merged, array); } return merged;}</code></pre>

This is my accepted solution

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You are given a list of sorted non-descending integer arrays, write a function to merge them into one sorted non-descending array. merge( [ [1,1,1,100…