每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 255

大数据应用 · 公众号 · 大数据 · 2017-12-15 10:45

正文

从6月15日起，数据应用学院将与你一起温习数据科学（DS）和商业分析（BA）领域常见的面试问题。从10月4号起，每天再为大家分享一道Leetcode算法题。

希望积极寻求相关领域工作的你每天关注我们的问题并且与我们一起思考，我们将会在第二天给出答案。

Day 155

DS Interview Questions

Describe the basic layer structure of ANN and what each part represent for.

BA Interview Questions

What is the best way to use Hadoop and R together for analysis?

Leetcode Questions

Description:

Find the contiguous subarray within an array (containing at least one number) which has the largest sum.

Input: [-2,1,-3,4,-1,2,1,-5,4]

Output: 6

Assumptions:

containing at least one number

欲知答案如何？请见下期分解！

Day 154 答案揭晓

DS Interview Questions

Describe what is the Artificial Neural Network?

An Artificial Neural Network (ANN) is a computational model. It is based on the structure and functions of biological neural networks. It works like the way human brain processes information. It includes a large number of connected processing units that work together to process information, which can generate meaningful results from it.

BA Interview Questions

R programming: what is the differences between the values of “coef()” and “（exp）coef” when you have a regression model?

As you know the hazard function is modeled as: h(t)=h0(t)exp(β′x)

The exp⁡(β1) is the ratio of the hazards between two individuals whose values of x1x1 differ by one unit when all other covariates are held constant. The ratio of the hazards of any two individuals ii and jjis exp(β′(xi−xj))exp⁡(β′(xi−xj)), and is called the hazard ratio (or incidence rate ratio). This ratio is assumed to be constant over time, hence the name of proportional hazard.

Leetcode Questions

Description:

Follow up for N-Queens problem.

Now, instead outputting board configurations, return the total number of distinct solutions.

Input: 5

Output: 10