Given two binary trees, write a function to check if they are equal or not.

题目大意： 给定两个二叉树，判断两者是否是相同的二叉树。即结构相同且对应节点的值也相同。

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Therefore rule sets comparing algorithms were employed to decide whether multiple rule sets were equal or not.

因此，需要使用规则集比较算法，判断这些规则集是否等价，以达到检测出错误配置的目的。

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Some people believe that women should play an equal role with men in a country police force or military force, while others think women are not suitable for these kinds of jobs.

一些人认为女性应该在国家警察机关或军队中扮演与男性平等的角色，而另一些人认为女性不适合做这类工作。

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"I agree with Judge Douglas," Lincoln said, "that the Negro is not my equal in many ways certainly not in color, perhaps not mentally or morally.

VOA: special.2009.06.11

He is not his equal by nature and cannot be made so by human laws or human institutions.

他们天生就不平等,更不能通过世俗的法律与制度获取平等

耶鲁公开课 - 美国内战与重建课程节选

n Alright. So if n is less than or equal to 1, return n. Well that's not right, right?

好吧，如果n小于等于1，它会返回，这里不对，是吧？

麻省理工公开课 - 计算机科学及编程导论课程节选

The labour share of income is not equal or equivalent to wages and salaries.

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Simple logic tells us that the opposite is the case, that when money is unstable the wonders of trade are compromised for the baker or vintner or both not receiving equal value for their production.

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But open innovation does not equal an ideas fest or an ideagora.

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