Blackrock Senior Software Engineer Interview Questions and Answers

Few basics of java
Dsa question

Q1. Java multithreading questions
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Q2. Spring boot questions.
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Q1. Longest Increasing Subsequence
Ans. 
Find the length of the longest increasing subsequence in an array.
• Use dynamic programming to solve this problem efficiently.

• Iterate through the array and keep track of the longest increasing subsequence ending at each index.

• Example: For array [10, 22, 9, 33, 21, 50, 41, 60, 80], the longest increasing subsequence is [10, 22, 33, 50, 60, 80] with length 6.
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Q1. UseEffect polyfill
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A polyfill for useEffect mimics React's useEffect behavior in non-React environments.
• useEffect is a React Hook that allows you to perform side effects in function components.

• A polyfill can be created using JavaScript closures to mimic the behavior of useEffect.

• Example: A simple polyfill could store effects in an array and execute them after rendering.

• You can use setTimeout to simulate the component lifecycle for cleanu...read more
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Q1. Frequency of character in string
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Q1. Reverse a string
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