ThoughtSpot Software Developer Intern Interview Questions, Process, and Tips

A 90-minute coding test on HackerRank, which includes one medium, one easy, and one hard question.

Q1. What is the index of the first occurrence where a pattern string matches with a text string?
Ans. 
The index of the first occurrence where a pattern string matches with a text string.
• Use string searching algorithms like Knuth-Morris-Pratt or Boyer-Moore for efficient pattern matching.

• Iterate through the text string and check for matches with the pattern string.

• Return the index of the first occurrence where the pattern matches with the text.
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Q2. Given a string, how can we find the minimum length substring whose sum is greater than or equal to a specified target?
Ans. 
Use sliding window technique to find minimum length substring with sum >= target.
• Initialize two pointers at start of string

• Expand window by moving right pointer until sum >= target

• Shrink window by moving left pointer while updating minimum length

• Repeat until end of string is reached
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There were 3 questions in the online assessment.

1 - Binary Search
2 - DP
3 - Graphs

Q1. Implement a persistence stack with constant time operations
Ans. 
Implement a persistence stack with constant time operations
• Use a combination of a stack and a hashmap to achieve constant time operations for push, pop, and get operations

• Maintain a stack to store the elements and a hashmap to store the index of each element in the stack

• When pushing an element, add it to the stack and update its index in the hashmap

• When popping an element, remove it from the stack and also remove its i...read more
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Q1. Median of two sorted arrays and OOPs basics
Ans. 
Finding the median of two sorted arrays and discussing OOPs basics
• To find the median of two sorted arrays, merge the arrays and then calculate the median

• OOPs basics include concepts like encapsulation, inheritance, polymorphism, and abstraction

• Example: Median of [1, 3] and [2] is 2.0
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