For example, if the complexity order of the current technique is O(n**2), speeding up the steps by 10x is a lot less helpful than finding an O(n) substitute.

例如，如果当前技术的复杂性等级是 O(n**2)，那么将这些步骤加速 10 倍远不及寻找 O(n) 替代品来得有用。

youdao

Listing 2's implementation runs in o (n) time. I won't prove this, but the running time of Listing 1's naive, recursive implementation is exponential in n.

清单2中的实现所需的时间比清单1短许多，清单2的运行时间为O (n)，而清单1中的递归实现的运行时间是n的指数。

youdao

The first thing that I need to point out is you can actually see an n 2 versus o 2 that we flip-flopped N2 just like sometimes we had glitches in filling up our atomic orbitals.

我要指出的第一件事情就是,你们可以看到,和O2比，the，energy，of，the，sigma，and，the，pi，2，p，orbitals。，So，this，is，a，glitch，我们把sigma和π2p轨道,能量翻转过来了。

youdao

Well, this question mark becomes an O, this question mark becomes an O, and then the loop terminates 0 1 2 because it's iterating from zero to N so that's zero, 1, 2 and the length of the string is 3 so the loop terminates, but I remember that I needed to have this special sentinel value so I'm just going to put it there manually.

嗯，这个问号变成了，这个问号变成了0，然后循环结束了,以为迭代从0到N，那就是，字符串的长度是3，然后循环就结束了，但是我记得我需要这个特殊的标记值,所以需要手动的加上它。

哈佛公开课 - 计算机科学课程节选

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