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This problem asks for a machine learning model that can predict whether or not a loan will default.

About this solution: This is a good start, but the candidate's solution is incomplete. In order to make an accurate prediction, the machine learning algorithm would need to take into account a variety of factors, such as the borrower's credit score, employment history, and the amount of the loan.

Databases / SQL
SQL

Given a list of customer names and their purchase amounts, this SQL query will find the total amount spent by each customer.

About this solution: The solution provided is correct and demonstrates a good understanding of SQL. The approach is clear and concise.

Machine Learning / Data Science
DifficultyMedium

A machine learning algorithm is used to identify which features in a dataset are most predictive of the target variable. This can be used to reduce the dimensionality of the data and improve the performance of the machine learning models.

About this solution: The candidate's solution is complete and solves the problem. The candidate has correctly identified that a feature selection algorithm is needed to identify the most predictive features. This is a good approach to the problem.

Databases / SQL
SQL

This technical problem deals with creating a function that will take in an array of integers and return the sum of all the even numbers in the array.

About this solution: The candidate's solution correctly calculates the sum of all even numbers in the array. However, the solution could be more concise. For example, the candidate could have used the built-in SUM function to calculate the sum, rather than creating a new table.

Databases / SQL
SQL

Write a SQL query to find the products with the highest price from a given table.

About this solution: The candidate's solution is correct and solves the problem. The approach is straightforward and easy to understand.

A system that can automatically detect plagiarism in documents is needed.

About this solution: The candidate's solution demonstrates a level of completeness and solves the problem. The general approach is efficient and would work well in practice.

To find the sum of all elements in an array, simply iterate through the array and add each element to a total sum.

About this solution: The candidate's solution is correct and demonstrates a level of completeness. The candidate's approach is clear and understandable.

None

About this solution: The candidate's solution is complete and solves the problem. The candidate's approach is to first find the adjacency matrix A, then the matrix giving the number of 3 step walks, then the generating function for walks from point i → j, and finally the generating function for walks from points 1 → 3.