对科学家而言，分析和比较两种掌握双语且其中有一种语言是相同的人是有重大意义的。

For scientists this is of great interest – analysing and comparing two bilingual populations who share one of their two languages.

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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。

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

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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。

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

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