In this page, I collect some questions that are frequently asked in interviews for quantitative researchers. The questions are categorized by topics.

Hopefully, you will find interesting questions and enjoy solving them. Several questions are not attached with answers. If you have any ideas, please feel free to share them in the comments and I will edit and update the answers to the answer page.

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Linear Algebra

Integer Matrix Inverse

Unknown

What are the sufficient and necessary conditions for an integer matrix to have an inverse such that elements in this inverse are all integers?

Second Largest in Array

Redbook, 红薯哥.

从一个数组中找出第二大的数，最少需要进行多少次比较?