每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 340

Day 240

Give some classification situations where you will use an SVM over a RandomForest Machine Learning algorithm and vice-versa.

Case interview: basic business problem (if product X costs Capital One $4.00 per unit, with an $800 sunk cost, and we charge X amount of dollars along with a $10 annual fee, how many do we need to sell to break even, etc). Followed by a longer discussion of more complex problems that the situation might entail

Sqrt(x)

Description: Implement int sqrt(int x).

Input: 2147483647

Output: 46340

Day 239 答案揭晓

What is seasonality in time series modeling?

Answer:

Seasonality in time series occurs when time series shows a repeated pattern over time. E.g., stationary sales decreases during the holiday season, air conditioner sales increases during the summers etc. are few examples of seasonality in a time series.

Seasonality makes your time series non-stationary because the average value of the variables at different time periods. Differentiating a time series is generally known as the best method of removing seasonality from a time series. Seasonal differencing can be defined as a numerical difference between a particular value and a value with a periodic lag.

Description:

Given two binary strings, return their sum (also a binary string).

Input: a = “11” b = “1”

Output: “100”