将[1,2]和[7,8]合并为[[1,7]，[2,8]]的最有效方法是什么 [英] What is the most efficient way of merging [1,2] and [7,8] into [[1,7], [2,8]]

问题描述

给出2个数组[1,2]和[7,8]，最有效的方法是将其合并以形成[[1,7]，[2,8]].我知道我们可以做到:

Given 2 arrays [1,2] and [7,8] what is the most efficient way of merging that to form [[1,7], [2,8]]. I know we can do this:

a1 = [1,2], a2 = [7,8], a3=[];
for (var i=0; i<a1.length; i++) {
  a3.push([a1[i], a2[i]]);
}

我正在处理各种各样的事情.所以我想看看是否有更好的方法.

I am dealing with a large array. So I want to see if there is a better way.

推荐答案

没有比O(n)更快的方法了，因为每个元素都必须被触摸一次.

There is no way to do this faster than O(n) because every element must be touched once.

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