BlackRock Interview Questions

Given a directed acyclic graph (DAG), find the length of the longest path in the graph.

What is serialization in Java?

What is the 'finally' block in Java, and when is it used?

Given a string, find the length of the longest substring that contains only unique characters.

Describe the differences between a left outer join and a right outer join in database systems.

Implement a stack using two queues.

Explain how you would design a Minesweeper game in Java.

You are performing a regression of Y on X and observe that the variability of the residuals is unequal across the range of X. What can you infer from this?

If you have three rolls of a die, and after the first and second rolls you can choose either to accept your current roll or roll again, what is the optimal strategy to maximize your final roll, and what is the expected value of your outcome?

What is the angle between the hour hand and the minute hand at 12:15 on a standard clock?

Reverse a string in Java.

Describe Principal Component Analysis (PCA).